Symptoms

When you try to deploy a K2 workflow, the K2 Designer deployment panel seems to hang until there is iteration, ie toggling between tabs then it moves on. Leaving the deployment will result in one thinking the deployment is stuck.
 

Diagnoses

deployment wizard is just not updating and hanging until you toggle between tabs in FIREFOX, this ONLY happens in FF when firefox is running in full screen, if you make the FF window not to fit/full screen it works as expected.

IE also works fine.
 

Resolution

Workaround:
Disable the firefox hardware accelerator
http://www.askvg.com/how-to-disable-hardware-acceleration-gpu-rendering-in-mozilla-firefox-4-0-to-fix-font-problem/

Logged as a bug, all though based on the workaround there is a good chance this is not a K2 issue, and might be related to FF Hardware Accelerators in combination to the machines video hardware and drivers.

Regards
Vernon