Oh, sorry to hear that.
Then I am out of ideas.. ( it worked for me, may for others )(
/umbrood
PS. Did you use the slider in the app or write timespeed 2 in the console?
I did the latter.
Not sure what the rules are on 3rd party apps.
But seeing as things are as they are!
Download Universal Unreal Engine Unlocker. ( Not going to linkt it as I am sure that isnt allowed ).
In it you can set time speed, setting it to any numberr other then 0 will start the ingame clock again.
Hope this helps.
/Umbrood