Have you manually gone to Windows Update, ensured that Microsoft Updates are enabled and downloaded ALL of the latest updates, including the non-critical updates that don't install automatically? Have you ensured you have the latest version of Quicktime also?
Have you ensured that all of your photos have been resized to no larger than 2000x1500 pixels in size, per the recommendations on this site and in my books?
What model of camcorder is your video coming from and what format and resolution is it?
What are your Project Settings, as listed under the Edit menu?
Also, with PrE 10 and an nVidia GPU, have you seen the ANNOUNCEMENT at the top of the main forum page:
ANNOUNCEMENT: Premiere Elements 10 NVIDIA Video Card Driver Roll Back
If you are a Premiere Elements 10 user whose Windows computer uses a NVIDIA GeForce video card and you are experiencing Premiere Elements 10 display and/or unexplained program behavior, then your first line of troubleshooting needs to be rolling back the video card driver version instead of assuring that it is up to date.
Since October 2013 to the present, there have been a growing number of reports about display and unexplained workflow glitches specific to the Premiere Elements 10 user whose Windows computer has a NVIDIA GeForce video card. If this applies to you, then the “user to user” remedy is to roll back the NVIDIA GeForce video card driver as far as is necessary to get rid of the problems. The typical driver roll back has gone back as far as March – July 2013 in order to get a working Premiere Elements 10. Neither NVIDIA nor Adobe has taken any corrective action in this regard to date, and none is expected moving forward.
Since October 2013, the following thread has tried to keep up with the Premiere Elements 10 NVIDIA reports
Older NVIDIA GeForce drivers can be found
A February 2014 overview of the situation as well as how to use the older NVIDIA GeForce drivers for the driver roll back can be found
This information graciously provided by ATR.
To date all the Premiere Elements 10 NVIDIA issues have been restricted to the GeForce not the Quadro. So, I am doubtful that your issue will fall into the epidemic that has been specific to the Premiere Elements 10 NVIDIA GeForce users and driver roll back. The Announcement is specific to NVIDIA GeForce. I did a quick Google search to determine the different between NVIDIA GeForce and Quadro
Please browse through the following Adobe project on damaged projects to determine if you can pick up on anything in it that would apply to your situation.
I would ask this..."Does the problem exist if, in one day, you open a new project, edit the project, save/close it/and then in about one hour reopen it?"
Or is it only the project saved/closed/left overnight and then reopened the next day that is giving you problems?
When you get a chance, I would be interested in your reply after you have answered SG's questions first.