I downloaded and compiled the latest 147u1 and I am happy to report that does indeed work as intended! I ran 'mame32_147u1 marble' several times and the video mode stuck on cocktail as it should.
As a second test I now complied-in the highscore patch from hiscore patch (hi_147u1.diff) and tried it again.
I ran 'mame32_147u1_hi marble' and found it *does* have the problem. So now it's narrowed down to the highscore patch causing the problem.
Now a third test I disabled all the hiscore patch options and now I find the problem goes away again.
In mame.ini: # # CORE MKChamp OPTIONS # disable_hiscore_patch 1 disable_nagscreen_patch 1 disable_loading_patch 1
Further testing and narrowing it down shows that of the 3 options, its the "disable_loading_patch" alone that causes the problem:
*Solution* when using the hiscore patch, you must set "disable_loading_patch 1" in mame.ini or you will lose your video mode every third run.
Thank you all so much helping!
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