Found that when upgrading a cluster from R81 to R81.10 that is using guacamole settings for ssl vpn on the mobile blade, that the upgrade overwrites the configuration for the guacamole.
The affected files included:
GuacDispatcher.C
cvpnd.C
guacd.pem
after getting the files back where they should be I had to run
rehash_ca_bundle (for the .pem certificate)
cvpnrestart (to re-initialize the cvpnd process)
Once this was finished, the users deleted their 'desktop' shortcuts and were successful once again.
Paul G. CCSM