Error on minute screen after ~60 seconds of operation

1. Intealled Version: 1.6.0beta2rc1_50_g6d70697 (overall looks good!)
2. Run ./memcachetest -h 10.211.55.5 -i 10000000 (long load test)
3. Watched the minute stats
4. After about ~60 seconds the screen was refreshed to cluster overview with the following error: "An error was encountered when requesting data from the server. The console has been reloaded to attempt to recover. There may be additional information about the error in the log."
5. going back to the minute screen it works but the problem reoccure.
6. Going directly to the cluster overview, getting: "An error was encountered when requesting data from the server. The console has been reloaded to attempt to recover. There may be additional information about the error in the log."

Attached is the log.