[Zope] XMLRPC problems?

Zope 2.7.6, ZEO, Python 2.4.1 (yes, I know it is not yet official but ... ZEO runs on the same machine but is accessed through an internal network ZMYSQLDA 2.0.9 MySQL-1.1.7 I've seen a couple of problems attributable to XLRPC failures in our system after an upgrade to Zope 2.7.6. Has anyone else experienced problems? I know there were issues at one point, but I believed that they have been resolved. I checked and found no active bugs.