By the way, just found out some other settings that have been randomly changed ... the double click didn't switch to full screen anymore, as well as the capture image didn't work anymore, the shortcuts have been disabled ...
That is very annoying, .... so what I just did was to, completely remove every trace of BSplayer on my computer and reinstall version 2.3.1 ... and all the settings came back to normal, well just need now to change my preferences .... HOW ANNOYING
EDIT:
Just got the same problem again (window disappeared), just by checking or unchecking the "memorise position" stuff .... must play with that long time to finally get it back ... I will never touch this button anymore
