Maybe not that of a big problem. Maybe a bit hard to describe.

I have a table (MSSQL) with many columns 400+.
It is filled with many rows.

When starting the dbExplorer and showing the table is all works. But setting it to full screen make if continuously does a refresh and keeps on doing that. Never had it before.
Recently switched to a 4k Screen so the resolution is 3840*2160, so possible that is the problem.

The Studio "Preview" file does not have the problem. Is also much faster but has by far not the features of the dbExplorer. So maybe it is time to swap out the "legacy" grid for the codejock controls.