Hi Tobias,
I've upgraded a number of servers to 4.88 last weekend. I've noticed some items in Event Viewer since this took place. Seems to be happening on a number of servers, but not nessicarily affecting the application. (Syncs are working fine.)
Event Type: Error
Event Source: ExtremeSyncService.exe
Event Category: None
Event ID: 0
Date: 06/02/2010
Time: 7:24:57 PM
User: N/A
Computer: GOSIIS1
Description:
The description for Event ID ( 0 ) in Source ( ExtremeSyncService.exe ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Access violation at address 0086AA0A in module 'ExtremeSyncService.exe'. Read of address 00000513.
This error seems to come and go, on multiple servers.

