Hi, don't know if this has already been posted or not but for all those who are having problems connecting to ICQ via Trillian - don't despair!
There is an update available on Trillian that should fix your ICQ (and AIM) problems you may have had in the past few days.
In Trillian go to
"Help" (top right corner") and click
"Check for Updates".
It should give you a window confirming that an update is indeed waiting. Click
"Next". The update will install and Trillian should restart.
ICQ should work well again, it did for me.
Hope this helps someone here.
Thanks