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When Camtasia Studio or SnagIt grabs a solid block of color instead of an image which looks fine on the screen, the problem is usually due to graphics hardware acceleration being used to display the image. The newer media players from Microsoft and RealNetworks are good about trying to use any graphics hardware acceleration that is available on the system.

For example, some systems have graphics hardware that can perform a "hardware overlay" of video on the screen, which bypasses the normal Windows display memory that Camtasia Studio and SnagIt capture. Most video capture programs that capture video from a video camera use "hardware overlay" by default for their video preview. Note that this kind of problem affects all screen capture programs, and even the image put in the clipboard by the Print Screen key.

The best solution is to disable hardware acceleration in the application that is playing the video, or disable hardware acceleration system wide. Because this effects all applications on the system, it may cause performance problems for some applications and others may not run at all.

To disable graphics hardware acceleration globally for all applications:

On Windows XP or 2000, select Control Panel > Display > Properties > Settings > Advanced > Troubleshooting.

On other versions of Windows select Control Panel > System > Performance tab > Graphics > Advanced settings. In both cases slide the Hardware Acceleration slider to None.
How to Disable Hardware Acceleration
Windows Media Player: In Media Player 7, select Tools > Options > Performance. In Media Player v6.4 and earlier, select View > Options > Playback. In both cases, slide the Hardware Acceleration slider to None.

RealPlayer: From the Tools menu select Preferences> Hardware and set the Video Card Compatibility to Most reliable by moving the slider all the way to the left.

RealPlayer G2: Select Options/Preferences from the RealPlayer menu. Go to the Performance tab and disable (uncheck) the Use optimized video display setting. You may need to close and restart RealPlayer G2 to have the change take effect.

Apple QuickTime: Edit > Preferences > Streaming Transport. In the dropdown box, select Video Settings and uncheck all of the DirectDraw options.