Where is mouse contol in new version???
 

Why in new version of BSPlayer 2.21.950 I can’t resize video with mouse scroll and can’t go in full screen with 2clicks on video window, as it was in previous releases…

Have you tried to reset the keys assigned in BS.Player (Options -> Key definitions & WinLIRC- > Reset to default)?
Otherwise try this utility and blank all keys, then in BSplayer reset everything to default...

As last alternative, rename (or delete) the file C:\Documents and Settings\USER_NAME\Application Data\BSplayer\bsplayer.xml
if you can't find that file there, search in BSplayer installation folder