There is an issue that can lead to a blank screen, the unit might look like frozen then.
In this case, just hit the "Softbutton 4", which is directly left to the BROWSE knob. The unit should work normal then.
This is again the same issue that was showing up with rig import and rig delete: the dialog window ("ok") not showing up. Thanks for the head up, this put the problem under another light. Would you. please, be so kind to mail this information to Support through the mail on the webpage? Thanks and well spotted!
This is a so called "race condition" where a dialog prevents rendering of the display content when it opens on a specific time.
It is already fixed and will be gone in the next available version.
Are you a team member, Timo?
Time is one of the developers and thus one of the "good guys". He has helped me a lot.