Need some help with the Shivering Isles.

[EcstaticObsessive]

I really don't like to start threads just to help with one problem, but I can't seem to find an answer anywhere else, and I'm rather desperate.

Anyways, I just need a bit of advice on how to deal with a glitch I've encountered in the Shivering Isles. I'm up to the quest where you take over one of the houses. I've chosen to take over Mania and kill Thadon. I've got the Greenmote, yet when I sneak into the Duke's quarters to poison his meal and wine it's never there. The quest markers are, but the meal never moves from his table in the House of Mania.

I'm sneaking in at the right time, and everything, but the meal is never there.

So, anyone else ever encountered this problem? Anyone have any ideas on how to fix it? I'm considering uninstalling Shivering Isles altogether, although I'd prefer not to, I'll do it if there's no other option, though.

 

[Takolin]

I'm not sure what the problem is, but this might be a solution.

There seems to be a problem with sneaking Greenmote into Thadon's meal where an activation option is not available.
This appears to be due to the time of the day you attempt to activate it. If too early or too late it will not be available. Try to enter the area around 4pm game time to place the Greenmote. Once Thadon's assistants begin to leave the area, the window of opportunity is over for the day.

Taken from: http://www.uesp.net/wiki/Shivering:Ritual_of_Mania