I've found a magic solution for the sliders' numbers showing 0 at first problem.
As I've been changing the UI package file, I made several versions of that file. And the problem's gone in all versions except for the original one. In one version, everything is exactly the same as the original version, but that problem is gone in there too.
So, the solution is:
Change anything (and then undo it manually) and save.
OR:
Change anything, save, then undo, then save again.
I don't know, I've saved another version of the file after any change.
peterfaj
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