Hi:
I have a CentOs 6.6 system (lots of CPUS, lots of RAM) running VirtualBox. Some time ago I had installed a VM from an Oracle Developer Day which had Oracle Linux 6 on it along with Oracle 12c DB, SQL Developer, etc. That's been running fine. I noticed a new VM that was Oracle Linux 7 and Oracle DB 12c, SQL Developer etc. so I got that image and imported it, creating a new Oracle Linux 7 VM.
It comes up fine but every few minutes it does a refresh of some kind involving the entire desktop. Everything freezes for a few seconds, then the red image of the background turns to black (but I still see all the icons), then entire screen goes gray (no icons), and usually things come back. Usually. But sometimes I am greeted with "Oh no! Something has gone wrong...and the system can't recover". The machine isn't dead but I have to log in again and my sessions are gone.
I've only had the machine up for a half hour or so, so I don't know if it is certain activity that is driving the refresh or what. This is a major pain. Is this a known issue? How do I get rid of it?
Thanks
P.S. The VM image in question can be found here.