What is your graphic adapter hardware and driver version... and do you have DUAL graphic adapters?
Display driver & Baddriver https://forums.adobe.com/thread/1701412
Dual video problems - Do you have dual graphics adapters?
Go to the Windows Control Panel and select Hardware and Sound and then select Device Manager... In Device manager you click the + sign to the left of Display Adapters... and see if 2 are listed
IF YES, read below
-link to why http://forums.adobe.com/message/4685328
-HP Fingerprint/Password conflict http://forums.adobe.com/thread/911575
-Mac Utility for dual adapters http://forums.adobe.com/thread/1017891?tstart=0
Premiere Elements 11 on what computer operating system?
For now I am assuming Windows 7, 8, or 8.1 64 bit.
If you have kept to the same video card/graphics card arrangement that you have been using successfully for the past 2 years, it would not seem that 1 versus more than 1 video card/graphic card scenario is involved in your issue.
But, have you updated the video card/graphics card so that it is up to date according to the web site of the manufacturer of the card or the manufacturer of the computer? Is your video card/graphics card on an automatic update schedule? In that regard, consider
a. the video card/graphics card needs updating to the latest version
b. you have the latest version of the driver which was automatically updated, there is a problem with this recently updated driver, and you need to roll back the driver version?
Also, have you started using new video with a format that you have never used before?
If no solution from any of the above, then please delete the BadDrivers.txt as I have written about and John has pointed to.
However, these are instructions written for Premiere Elements Windows 7, 8, and 8.1 64 bit, not Premiere Elements Mac.
We will be watching for your results.
Add On...can we assume that in those 2 years of success, you have been using Premiere Elements 11 all that time on the same computer with the same video card/graphics card installed?
Thank you so much, I found the driver and updated it. Although this wasn't exactly the solution you were trying to communicate, it fixed the problem. Thanks for leading me to the solution.