Slight, but annoying problem.
 

Whenever I double click the video to go full screen it goes black, but the audio keeps playing. When I double click again I can see the video.

Two things I've noticed....

If I hit M, for movie mode, i can see the video in full screen

If I right click, go to pan-scan, then auto, i can see the video .. (the black goes away)

but just double clicking it goes black

it never did this before

Press Num 5. Does this help ?

Unfortunately no :(

Chnging video rendering from internal default to directdraw ?

Try adicoto's suggestion.
Otherwise try to delete the BSplayer.USER_NAME.xml preferences file and then open BSplayer..

Changing to directdraw I get the same result and I can't find a file like the one that was described to delete

The file is placed in the UserProfile folder (Windows XP).
i.e.: C:\Documents and Settings\USER_NAME\Application Data\BSplayer\

Note: some folders are hidden, so you must enable the option to show hidden folders in Tools -> Folder Settings in explorer window

If it isn't there (also depends on Windows-version and BSPlayer's version), check in BSPlayer's installation folder:
(default) C:\Program Files\Webteh\BSPlayer\...
:wink:

IMHO it wasn't good idea to put the config file in System (that's the same) directory. That is a step closer to integration in Windows and cease to remain a separate application.

You can search for the config file by entering bsplayer.*.xml using any decent file manager or the Windows integrated tools.