Look-ups don't work

I have a form with several fields that are look-ups based on other tables or views. When the form opens loader appears. If I click to open one of the look-ups while the loader is spinning, the look-up won’t open and no other look-up works until I give F5.
Has anyone had a situation like this?

did you give the current user / userlevel lookup permission to the required table ?

Cannot reproduce the issue. Lookup Table works properly until v2020.0.11.

So please answer the question that asked by @sticcino above.

It seems that after restoring the template defaults, cleaning the chache and generating it again is working. I will monitor and if necessary return to the subject.
With respect to the permissions they had already been given.