We have probably the same problem as in this post. I tried to import a project from a troubled server to a new one. The only special point is that we could not detach the project on the original server before moving it.
Unfortunately, this post does not provide a solution. Does anybody have some ideas what I could test or check to solve this problem? Is there a simple way to re-read or re-create plots and thumbnails? It would be also interesting for me to learn where this information is stored or how it is generated.
4.7.1 on the broken server, and I upgraded the new cs server to the same version. We have some disk issues on the old server, which will hopefully be resolved in about a week, however, we want to move forward with a pressing project meanwhile.