Quite a long time ago I created a shortcut to mimic the Exit to DOS from the START icon. Both use C:\WINDOWS\DOSTART.BAT which is identical to C:\DOSBOOT\Autoexec.bat
However, the normal Exit to DOS does not have the features that the shortcut allows to substitute new versions of AUTOEXEC.BAT and CONFIG.SYS
I don't know when it first started, but the normal Exit to DOS now fails to return from setting the sound blaster parameters, and the computer hangs at that point.
In experimenting with the shortcut version, I have found that it will fail also when it is prevented from substituting changed versions of AUTOEXEC.BAT and CONFIG.SYS
so it acts like a driver problem.
The only clue so far is that remarking out the CONFIG.SYS in the shortcut results in a single entry of DOS=SINGLE which I have not been able to identify. A search with Google didn't provide a clue.
Has anybody seen anything like this before?