Hi,
My preview pane display fine with RTF files with pictures.
Did you set the accosiation of RTF file with Microsoft word?
If not, please first set the RTF file opened by Word, and check if your issue still persists.
Not sure if this issue can be caused by 3rd part software conflict, please check if it can work in Clean boot mode.
How to perform a clean boot
http://support.microsoft.com/kb/929135
If the issue doesnt appear, you can determine which one can be the cause by using dichotomy in MSconfig. Checking on half of Non-Microsoft service and restart, determining which half of the services cause the issue and repeating to check half of the problematic
half services.
In addition, since this preview pane works as a Windows feature, please try to repair system by following command to see if we can fix this issue:
Run CMD as admin:
Dism /Online /Cleanup-Image /RestoreHealth
Any update on your issue, please post back with your test results.