I had exactly the same problem but with an app using the default Atlas styling. The problem went away after I did the following:
No, I don’t. Got the exact same problem now. I hoped to solve it by re-downloading theme.zip from docs.mendix.com. The datagrid2’s improved, the cells of each object are at least on the same line, but still f8-up:
Did anyone stumbled upon a solution for this?