I have been using Valentina Studio 6.5.8. I created a diagram which was saved successfully. I even exported the diagram as a *.vdiagram file. I checked the content of that file and it has some content. After I reopened Valentina Studio I tried to reopen the diagram but this does not work properly. I can select the tables (as I see the selection border) but otherwise no data is visible. I cannot edit anything. Its just an empty grid. I tried to import the *.vdiagram file with the same bad results.
I updated to the current 6.5.12 version. But the problem was not solved.
I would be grateful about any help.