After upgrading the Foglight Experience Viewer appliance no hits are now being collected.
It appears that the Shared Memory Segments on this appliance have been corrupted, Currently it is not know how they got corrupted.
Reboot the Foglight Experience Monitor appliance (FxM). This should clear out the bad Memory Segments and allow processing.
If this step does not resolve the problem please contact Support for further troubleshooting and analysis.