Sorry to bring this out, but I have to lock MB at startup too.
The /OpenMainPlayerLocked option works, but MB is not totally locked compared to a manual locking from the file menu. With /OpenMainPlayerLocked it is possible to close the applications (the controls minimize, maximize and close are not hidden), and the switch between applications (alt-tab...) is possible.
Would it be possible to lock MB completely at startup exactly like the command View > "Main Player (Locked down)" do ?
Thanks.
Ps : with the last version 2.5 RC2.