This seems to happen if there is a runtime error in the LUA code.
Any chance you could invoke MAME with the following command line:
mame -plugin worker_ui -pluginspath <>
Enough reports like this have come in, suggesting that I need to make these problems easier to diagnose, among other things.
Profiles are a feature by which you can create a MAME session, and images will stay loaded across them, and if present, save states.
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