Acrobat/Reader cannot cope with internal Webserver connectivity problems, leading to comments being hidden/deleted. Any thoughts?

Question

Adobe Acrobat/Reader do not cope with interruptions to access to the internal WebServer hosting the PDF/XML review files.
Steps to reproduce the issue:
Connection is lost to the WebServer hosting the PDF review files.
After connection to the WebServer is regained, access to the PDF review files is blocked by Adobe Acrobat/Reader.
Sometimes this can be resolved by deleting the entire contents of the folder:
          C:\Users\<user-name>\AppData\LocalLow\Adobe\Acrobat\11.0\Synchronizer
NOTES:
We have experienced this behaviour especially when connecting to the WebServer via VPN. I reckon the connectivity issues could be initially our problem, that Acrobat/Reader simply do not handle.
Clearing the contents of the Synchronizer folder does not always work.
Team members have also seen situations where significant numbers of review comments or status values have been not been displayed, but exist in the XML review files. In some cases comments/status values have been automatically deleted without warning from the Adobe review XML files.
PDF reviews are sent out via email as links to the PDF review file hosted on an internal WebServer.
Writers and reviewers in the team either have either:
Acrobat XI Pro 11.0.08 with Reader 11.0.08
Acrobat XI Pro 9.5.5 with Reader 11.0.08
I have personally experienced the above behaviour with Acrobat XI Pro 11.0.08 and Reader 11.0.08.
Could this experience be connected the Synchronizer (http://helpx.adobe.com/acrobat/kb/known-issues-acrobat-xi-reader.html )?
For example, where a reviewer uses a different version of Acrobat/Reader?
Could anyone please provide a list of compatible versions of Acrobat/Reader?
Expected results:
Adobe Acrobat/Reader should really handle connection issues with a warning and later check for recovered connections.
However, what appears to be happening is that Acrobat/Reader writes some sort of blocking code to the Synchronizer folder that prevents future checks of the PDF review files on the review WebServer.
As far as I understand, the connection issues are not caused by Adobe software, however the problems we are experiencing relate to how Adobe Acrobat/Reader handle this loss of connection.
Plea for Help!
I have checked and the experience of missing comments and persistent "connectivity issues" seems to be a reported but sadly outstanding issue...
This has been an ongoing headache for some time, so solutions would be great, but any thoughts or suggestions are welcome...?
     For example, has anyone using SharePoint to host PDF reviews experienced anything similar?
Many thanks!

Answer 1

Adobe Acrobat 11.0.09 with Microsoft SharePoint Repository Trial Update
We've completed week one of a three week trial (see above) that will go on until Friday 24th October.
We currently have just four PDF files out for review that make use of the SharePoint repository.
To-date:
Each review file has had multiple concurrent reviewers posting comments over several days from both over the office LAN and also via VPN when working remotely.
Dynamic stamps seem to be working as hoped and are all visible.
We have not experienced any connection-type issues and the we have not had reason to clear out the Synchronizer folder as described above.
Counter balance:
I have experienced the situation with a remote VPN connection, where Adobe Acrobat could not connect to our internal WebServer repository. At the same time, I was able to connect to PDF review files hosted in SharePoint.
Summary:
The experience so far does suggest that problems are caused by the an inconsistent connection to the WebServer repository (especially over VPN) combined with Adobe Acrobat/Reader's inability to cope with the resulting situation.
At the moment I must say that while it is early days, I am hopeful that the combination of SharePoint as the repository and the update to Adobe Acrobat/Reader 11.0.09 will continue to prove to be reliable.
I'll provide an update to this post on Friday 24th October...
Here's hoping!