Logons to Hue is hung. We are using CDH4.8.
I had to restart it to fix this. But that is not long term solution as we will have many users accessing it going forward.
So this could be related to https://issues.cloudera.org/browse/HUE-1367 (and in particular Beeswax or Impala been down).
Restarting Hue will restart Beeswax so it is why it might have fixed it. Since Hue 3, the UX has been improved and Beeswax has been replaced by HiveServer2 so it will be better.
This is in C5beta1.