From: ChrisFromFlens on
Ok, meanwhile I found the reason:
There's a vbscript running on the computers, and in certain situations this
script is started by the command "at" as a scheduled task.
If this script starts the HTA, the HTA is a son-process of the taskplanner ,
which is not allowed to communicate with the desktop, and so the HTA is not
allowed to communicate with the desktop as well.... it runs invisible.

Don't know how to get the vbscript restartet once it crashed, but that's
another problem;)

Greets
Christian