Failure to crop and reposition video in preview screen

[LiesB]

When I crop and reposition my video the preview screen goes crazy. My cropped area is not showing the video, on the other side of the screen a black box appears. The video does not show while previewing. 

It happens with all my videos. (making a multiple video movie)

When I export, all is good, so there is something going wrong in the preview. 

Does anyone know what is happening here? Can you help me with this?

[borate]

Using dual preview (under OPTIONS | GENERAL tab), looks good here...

Upgrade to the latest release.  For licensed users upgrades are free for up to six months from purchase date.  After that, VP will continue to fully function but a fee will be required in order to register the newest.  Retain your old install file and registration info.

If that doesn't solve it,  please share your project.  Someone will take a look and come up with a fix.  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 ---  Upload the saved, numbered FOLDER.  Use a free server - Google Drive, MS OneDrive, etc.*  Do NOT upload the individual VPJ or export file. 
•     Get link --- Get a public link.  If using Google Drive click GET SHAREABLE LINK. Change "restricted" to "anyone with the link can view"  Click COPY LINK | DONE.
•     Share ---    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.