SQL replication issue worsening

Pre SP4, forum page updates would occasionally not correctly indicate the "you've read this thread" icon status (greyed icon). Post SP4 this is now the rule rather than the exception. It now also marks threads as read that I haven't read. It has been especially bad these past few days, seems connected to the slow server issue. I assume it is a replication issue, not actually sure.
[483 byte] By [nobugz] at [2008-1-9]