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bbfa235
(Get the code!)
gethin, that seems plausibly like it could suffer from the same problems as #49579 -- if you have a menu open or a virtualbox window to a guest or similar, the screensaver 'lock' command may not be able to lock the display.
That's why we recommend using the lock interface in the menus or keyboard shortcuts, because both will either succeed easily or visibly fail before you make the next step manually.
Thanks