Not reported.
What are the PC's specs: CPU/GPU/RAM?
Use this VP version.
Test whether disabling GPU helps. OPTIONS | EDITING tab. Under Advanced choose None (CPU only)... 
Confirm that the video card and Direct-X are current...
AMD / ATI users: http://support.amd.com/us/gpudownload/Pages/index.aspx
Intel users: https://downloadcenter.intel.com/default.aspx
nVidia users: http://www.nvidia.com/Download/index.aspx?lang=en-us
Update DirectX: http://support.microsoft.com/kb/179113
If these measures don't help, please share your project for analysis. The process is easy, quick and can be done privately. Just follow these steps...
Back up --- With your project on the timeline, click on MENU at the top-left. Click FILE|BACK UP PROJECT FILES TO FOLDER. Choose a folder and SELECT FOLDER.
Upload --- Use a free server - Google Drive, MS OneDrive, etc.* - to upload the saved, numbered FOLDER. Do NOT upload the individual VPJ or export file.
Get link --- Get a public link. If using Google Drive click GET SHAREABLE LINK. If necessary change "restricted" to "anyone with the link can view"
Share --- Click COPY LINK | DONE. Paste that link here, or click the folder at the top-right of this forum to message it privately to me. It won't be shared.
* Before uploading, right-click the folder, click PROPERTIES. Look at the File Size to confirm that it's not too big for the free space on the server.
