I am running the Teradici APEX 2800 cards in my servers. We did not have these cards prior to View 5.3 and ESXi 5.5. They are running Windows 7 x64 desktops with 2vCPU and 3GB RAM. I've uploaded gigs of logs to VMware already.
Can you post your case number so I can pass that on to VMware saying you are experiencing the exact same problem? I think they are going to give me a new case number, and I'll post that once I get it.