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[Smiling Spectre]

Hmm, I seen exactly the same several times... but it was long time ago... but I don't use Official builds anymore, so maybe that's really "official" bug...

But also several times it was totally different problem. Lost focus. If any application can draw focus to itself from DOSBox, it will "stuck" in last "remembered" position, until you'll return to it.

And, of course, "pointing" software, like MoO, will be much less affected by it then "moving" like Duke. Just because "stuck" pointer will do nothing in MoO, and you'll release it in next click.

Did you tried de-capture mouse with Alt+F10 instead Windows key? If it is capture issue it would help.

Clicking left mouse button theoretically would work too, but I never tried it.