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I have all my DVD's stored on the hardrive as ISO files. These all played perfectly with VLC until I installed 1.1.3 today. Now 90% will not play. Tried reverting to earlier versions of VLC but they still won't play. What has 1.1.3 done.

Be more specific. VLC 1.1.3 doesn't play ISO files because it misidentifies them (IIRC same with VLC 1.1.2).

No suitable decoder module:
VLC does not support the audio or video format "undf". Unfortunately there is no way for you to fix this.

That's the message I get with some. But with most of them nothing happens at all. They all worked with 1.0.5 (I think that was the one I was using)
I have removed all VLC files and reinstalled 1.1.3 but the problem remains the same. Why would it be misidentifying some iso files. Sorry to be thick, but is there a way I can look to see which files it likes and which it doesn't.

Does this log help. This is district 9 not playing.
main debug: adding item `DISTRICT_9.ISO' ( file:///C:/Documents%20and%20Settings/Administrator/My%20Documents/DVD%27s/DISTRICT_9.ISO )
main debug: rebuilding array of current - root Playlist
qt4 debug: Adding a new MRL to recent ones: C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO
main debug: rebuild done - 1 items, index -1
main debug: processing request item DISTRICT_9.ISO node null skip 0
main debug: resyncing on DISTRICT_9.ISO
main debug: DISTRICT_9.ISO is at 0
main debug: starting new item
main debug: creating new input thread
main debug: Creating an input for 'DISTRICT_9.ISO'
main debug: thread (input) created at priority 1 (../.././src/input/input.c:214)
main debug: thread started
main debug: using timeshift granularity of 50 MiB
main debug: using timeshift path 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp'
main debug: `file:///C:/Documents%20and%20Settings/Administrator/My%20Documents/DVD%27s/DISTRICT_9.ISO' gives access `file' demux `' path `C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO'
main debug: creating demux: access='file' demux='' path='C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO'
main debug: looking for access_demux module: 2 candidates
dvdnav warning: cannot open dvdnav
main debug: no access_demux module matching "file" could be loaded
main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms)
main debug: creating access 'file' path='C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO'
main debug: looking for access module: 2 candidates
filesystem debug: opening file `C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO'
main debug: using access module "filesystem"
main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms)
main debug: Using AStream*Stream
main debug: pre buffering
main debug: received first data after 0 ms
main debug: pre-buffering done 1024 bytes in 0s - 1000000 KiB/s
main debug: looking for stream_filter module: 2 candidates
main debug: no stream_filter module matching "any" could be loaded
main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms)
main debug: looking for stream_filter module: 1 candidate
main debug: using stream_filter module "stream_filter_record"
main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms)
main debug: creating demux: access='file' demux='' path='C:\Documents and Settings\Administrator\My Documents\DVD's\DISTRICT_9.ISO'
main debug: looking for demux module: 50 candidates
main debug: Creating an input for 'DISTRICT_9.ISO'
qt4 debug: IM: Setting an input
lua debug: Trying Lua scripts in C:\Documents and Settings\Administrator\Application Data\vlc\lua\playlist
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\playlist
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\anevia_streams.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\anevia_xml.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\appletrailers.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\bbc_co_uk.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\break.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\canalplus.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\cue.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\dailymotion.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\france2.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\googlevideo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\jamendo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\joox.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\katsomo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\koreus.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\lelombrik.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\megavideo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\metacafe.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\mpora.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\pinkbike.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\rockbox_fm_presets.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\vimeo.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\youtube.lua
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\playlist\youtube_homepage.lua
avcodec debug: detected format: mp3
main debug: selecting program id=0
avcodec debug: adding es: audio codec = undf
avcodec debug: AVFormat supported stream
avcodec debug: - format = mp3 (MPEG audio layer 2/3)
avcodec debug: - start time = 0
avcodec debug: - duration = 213161301333
main debug: using demux module "avcodec"
main debug: TIMER module_need() : 86.000 ms - Total 86.000 ms / 1 intvls (Avg 86.000 ms)
main debug: looking for a subtitle file in C:\Documents and Settings\Administrator\My Documents\DVD's\
main debug: looking for decoder module: 34 candidates
main debug: no decoder module matching "any" could be loaded
main debug: TIMER module_need() : 12.000 ms - Total 12.000 ms / 1 intvls (Avg 12.000 ms)
main error: no suitable decoder module for fourcc `undf'. VLC probably does not support this sound or video format.
main debug: killing decoder fourcc `undf', 0 PES in FIFO
main debug: looking for meta reader module: 2 candidates
lua debug: Trying Lua scripts in C:\Documents and Settings\Administrator\Application Data\vlc\lua\meta\reader
lua debug: Trying Lua scripts in C:\Program Files\VideoLAN\VLC\lua\meta\reader
lua debug: Trying Lua playlist script C:\Program Files\VideoLAN\VLC\lua\meta\reader\filename.lua
main debug: no meta reader module matching "any" could be loaded
main debug: TIMER module_need() : 0.000 ms - Total 0.000 ms / 1 intvls (Avg 0.000 ms)
main debug: `file:///C:/Documents%20and%20Settings/Administrator/My%20Documents/DVD%27s/DISTRICT_9.ISO' successfully opened
main debug: Buffering 0%
main debug: Buffering 24%
main debug: Buffering 48%
main debug: Buffering 72%
main debug: Buffering 96%
main debug: Stream buffering done (360 ms in 0 ms)
main debug: Decoder buffering done in 0 ms
main debug: no fetch required for (null) (art currently (null))

Just tried nightly build 1.2.0 That won't play ISO either.

I guess the issue is " ' "

libavcodec issue, I opened trac ticket for this. Thanks.
http://trac.videolan.org/vlc/ticket/4105