Error when opening Synchronization Project

Hello,
I am trying to test some workflows on a Universal Connector Interface synch project: the workflow triggers a process DPR_DPRProjectionStartInfo_Run_Synchronization which goes Frozen with the following error message:
"Error running synchronization.
(...)
There is already an element with the name (IdentSyncRoot)"

When trying to open the synchronization project from the Synchronization Editor tool, I receive the same error:

"Exception has been thrown by the target of an invocation
There is already an element with the name (IdentSyncRoot)"

I tried browsing through several Dialog and DPR tables in the Object Browser but I can't seem to find the source of this issue.
What could be the cause of the error? 
 
For additional info, this seems to be an issue isolated to the environment I am working on.

Thank you!