What about this : The replication task IS running: FunxTestSync 2012-09-25 10:18:50.. is your task start after the error message?
Also are you running the latest build of DSS ? if not then please follow the following steps:
- Please save all settings in the Maint. > Misc. and take all options.
- Stop the secondary system,
- Update the secondary system to new version,
- Start the secondary system,
- Wait for replication to be consistent,
- Start manual failover,
- Stop the primary system,
- Upgrade the primary system,
- Start the primary system,
- Wait for replication to be consistent,
- Start failback.

When it stopped at the last stage as, does it gave you error then continue, or only stopped ?