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When I switch to the higher resolution my mouse stops working. Playing in the low res makes the game difficult because it is not zoomed out enough. Any one able to help?

[Scatty]

Does that happen in a windowed or fullscreen mode? Did you try to press ALT+Enter to go into windowed mode and back to fullscreen again and see if that solves the problem? Also in dosbox.conf file right in the beginning, under [sdl], do you the option autolock=true or is set to false?

Happens in both windowed and full screen. Tried going back and forth and still frozen.
Auto-lock is true.

[Scatty]

What about saving the game in the high-resolution mode, closing DosBox, starting it again and running the game in high resolution from the start? Is the mouse still frozen then?

I saved it in full mode, quit, and then restarted. Loaded the saved game and it was set to the lower display.
There are various screens you switch to frequently and this is usually when the mouse freezes but game doesn't

[Scatty]

What DosBox version are you using to play the game? I'm using 0.73 but I think 0.74 also should have the same options for a setting in dosbox.conf under [dosbox] named machine=. Try setting it to machine=vesa_oldvbe or machine=vgaonly and see if any of those might help.