LV820 VarMgr Error 7 on close (no RT info)

Looking for suggestions regarding trouble with LV820 Variable Manager (VM) while viewing PXI RT system hosting single deployed Network Shared Variables (NSV) library.
Standard LV 'Error 7 occurred at New File' (file not found) dialog appears when close VM. Might this be a file access/protection issue? Does VM use separate ports that the psp protocol does not? Is this an actual file error (appears so) or just error 7 from variable server passed out?
No trouble accessing the variables in LV host/RT dev code or executable but cannot view the deployed lvlib on RT system. Can view in VM same library 'copied' then deployed to localhost. Use of Select Variable ... context menu item on Shared Variable node works and shows lvlib contents properly.
source: WinXP/SP2 on PXI-8105 in PXI-1052 chassis, 'Symantec Endpoint Protection' AV/firewall in use.
target: PharLap on PXI-8105 in PXI-1052 chassis
RT software: LabVIEW Real-Time 8.2, Network Variable Engine 1.2.0, Variable Client Support 1.2.0

After some exploring, I found TagMonitor.exe in 'C:\Program Files\National Instruments\Shared\TagMonitor' which appears to be an early rendition of DSM and shows my deployed RT libraries properly. As such, the urgency to get VarMan working is diminished but I would still like to see it working again, so ...
Answers:
- First observed this past Monday during software troubleshooting in LV.
- VarMan displayed SVs on RT previously without issue.
- No NI software changes. This is an existing test console with several years use.
In MAX 4.5, clicked 'Tools::Install legacy support ...' to view dialog that would appear but only got message dialog with: 'Support files are up-to-date for all recognized drivers on the syste, No updates are required.'
Other software: not sure as system is connected to inhouse network so some pushes do occur but system remains at XP/SP2. There was some kind of Outlook 2003 patch I saw from this past weekend.
- Software upgrade to newer version: unlikely since existing EXE software on stand still currerntly used and budgets are thin for upgrades and anyway, software updates may require hardware updates; not a good plan.
- Show stopper: none, as I previously mentioned software still works it just that VarMan is a useful debugging tool. My work-around is a simple polling/monitor app for the SVs of my particuar project but my concern is that this issue a symtom of some underlying communication error that may bite me later.
- Occurrence frequency: happens every time now.
Questions:
- NI software in Windows Add/Remove utility has Repair option but no line item for VarMan. Was this a base LabVIEW component or did it come with the RT module? Would 'Repairing' the LV 8.2 RT Module have any effect?
- Above 'Repair' options does not exist for Real-Time Sofware Wizard in MAX. Would Uninstall/Reinstall the 'Network Variable Engine' and/or 'Variable Client Support' items help?
- I asked before about specific TCP/UDP ports used by VarMan (psp protocol, etc.) that may be being blocked...no response.
- In VarMan, tried to manually add RT Target but nothing happened. Is there a way to verify of VarMan is connecting with RT system?
Additional:
- Am including screenshot of error and list of installed NI software on host & target.
- Since TagMonitor reliably communicates with RT, it appears this error is solely associated with VarMan.
Thanks for your help with this issue, Patrick.
Attachments:
VarMan.PNG ‏15 KB
Installed NI Software.txt ‏3 KB

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