Can you enumerate a few so I can check the functionality ?vlc_pgettext() was bugged in 1.1.0 but that's not really specific to subs. I can see that function used in 7 different places at least, one of which is subs. The PO file is fine.
Hm, I don't have this problem (with neither of the few past months 0.9.x versions).There are some graphical glitches in the Open Disc interface: