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Hello Milan,

All I can say is:

1. If I run Smart Cleanup Tools and let “postmeta record” be emptied the grids disappear from the backend/admin interface. They are still there (and in the frontend), but since I can’t edit them in the backend anymore it’s not an option.

2. If I rund Smart Cleanup Tools and exclude “postmeta record” the grids don’t disappear from the backend/admin interface.

So you see there definitely is a correlation between these two. I tried many other things to make sure it’s related to that and I can confirm that this is the case.