I am sorry for the vagueness of this issue for a user but I was unable to witness the event.
The user has windows 7, Lenovo x200 tablet, and VLC 1.0.3
he had three PowerPoint presentations open and opened a video in VLC by double clicking it to test. He then closed the video and showed one of the presentations. When he doubled clicked the video again, it would not load. The VLC screen resized correctly but the screen was grey and the control buttons were grayed out. The video he was trying to run was stored local and worked about 10 minutes prior. He tried several times to open it before he rebooted and it corrected the issue.
Any idea what could have caused this.