Fragmented IP Packets galore

SInce a couple of days PC is doing strange things: log gets filled with ‘Fragmented IP Packet’ (High Severity) Warnings, followed by ‘Access denied, ICPM=Time exceeded in reass’ messages.

This happens 100% of the time on www.youtube.com. I cannot access this site UNLESS I uncheck ‘Block fragmented IP datagrams’. (This did NOT use to be so).

Of course, I have ran all the checks (spyware, viri, etc), but to na avail.

Anyone?

Running XP/SP2, Comodo 2.3.6.81, 3Com 812 OfficeConnect Router, ISO=Telefonica Spain