Ok I have done some tests and 043.022 seems fine for me, the development is not, it disappears completely.
I know the test version and the development have the same thing in them that was causing me issues but 043.022 doesnt so I will let Brian know and it may help you if he can get it fixed.
There are a few differences though, when Mach disappears for me I do see a message, its too quick to read but I see the box for a fraction of a second. Also Mach completely closes, it is not left in apps or proc in task manager so that again is different.
Not sure when Brian will be back, should be today but may not be online until tomorrow.
Hood