Yes, but BSPlayer allows to easily return to the original image prior scaling to 0.75 height.
Back to topic: You can try to remove all BSPlayer's settings by renaming BSPlayer*.xml file to something else and then change options you suspect might affect full screen display one by one. The settings file should be located where Bsplayer.exe is or in "Documents and Settings\<windows_login>\Application Data\BSPlayer*\".
Edit:
I have reproduced your situation with anamorphic MPEG-2:
- Click on "Context -> Video -> Pan-Scan -> Auto"
****= Bad full-screen
- Click on "Context -> Video -> Pan-Scan -> Auto" again
****= Correctly scaled picture
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