I've had the same problem starting with TCUP 3.9. So I saved "icq.dll" file from the Miranda that was used in TCUP 3.8 and I substitute with it the one in newer versions of Miranda. The problem is gone 
Also the same thing happens with Jabber and same solution works.
So I think this must be Miranda's problem and not TCUP's.
Also the same thing happens with Jabber and same solution works.
So I think this must be Miranda's problem and not TCUP's.