huh...
maybe u can try 2:
remove the /nogui entry
restart twice (see what happens!)
after that add the /nogui entry again
restart twice & hope...
last try would b 2 start the debugging protocol, but i'm not shure if this is logged there...
sry, out of ideas if it doesn't help, since u did everything that could be done, imo.
good luck,
asyn