What operating system are you working on? Have you ensured that you have all of the updates (including those that do not install automatically) as well as the latest version of Quicktime and the latest drivers for your video card (downloaded from the nVidia or ATI site)?
What model of camcorder is your video coming from and what format and resolution is it?
When you started your Premiere Elements project, which settings did you select? If you don't remember, what Project Setttings are listed under the program's Edit menu?
In version 10 and prior versions of the program, you must manually set up your project to match your video specs or the program.
Exactly what are you editing, and what is the source? (camera brand/model... screen capture program... ???)
Codec & Format information, with 2 links inside for you to read http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30 for screen shot instructions
Free programs to get file information for PC/Mac http://mediaarea.net/en/MediaInfo/Download
Also, with PrE 10, do you have an nVidia GPU?
If so, see the ANNOUNCEMENT on the top of the main Adobe Premiere Elements Forum page. Many have had to roll-back the nVidia driver to an earlier version, to get the Video back.
Just saw your thread, and it looked like a candidate for the Premiere Elements 10 NVIDIA GeForce Roll Back the Driver issue. If your computer uses a NVIDIA GeForce video card/graphics card, then the following applies to you. You do not want to update the driver. Rather you want to roll back the driver version, probably to about May 2013. For your convenience I have done a copy/paste of the forum announcement which gives all the details and fix of the matter.
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 matter has been very specific to the Premiere Elements 10 NVIDIA GeForce card user. So, if your computer is using other than a NVIDIA GeForce card, it is likely that the message does not apply to you, and we can then explore other troubleshooting possibities.
Looking forward to your follow up. Do not hesitate to ask for clarification on anything written here.