Hi Osker,
That is good news - this tells me that whatever the issue was, it is a difference between the contents of the profile (XML) files.
1) Yes, 1024 refers to the pre-MSM screen sets. Sorry for the jargon - "1024.set" is the file name of the old mach mill 1024x768 resolution mill screens. Many people refer to it as simply "1024". So you did the right thing.
2) The steps you followed had you take the working mill profile, make a copy of it, then manually load the MSM screen instead of the old screens. The result is that you now have a working profile that runs MSM.
3) next step? none.
Just use the profile that you created (the one I referred to as MSM2 in my instruction steps) - it will be just fine for running MSM. The MSM2 profile will now start MSM when you start mach using that profile. Thus there is no next step - you're all set.
4) OK, this does leave open the intellectual question of what was the difference between the profiles that caused the issue.
Frankly, I'm going to ignore that, as whatever it is, it is not an MSM issue (which is the focus of the beta test phase).
I don't mean to sound like I don't care, but in some sense I don't
...this is an instance where (knowing that it is not an MSM bug), I just can't afford to spend the time needed to track down the details of a non-MSM issue.
Have fun using MSM, let me know if something else crops up.
Dave