Thanks for that information ... I suppose that you "all" have the same
problem that multiple selections are not available at all?? it isn't only
Ctrl+A which isn't working for me, none of the "select multiple files"
options work for me. SHIFT, CtrL and Mouse don't work ... this is even valid
when switching on the check box select feature!!!

You'll guess how disturbing this is ...

I'll try the suggestion to "reset" folders .. didn't work yet...