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What is going on when you have selected some text in a field and then gone to another application or another stack in the LiveCode application and you come back to the the original selected material. At that point you cannot click on the original field and get a new insertion point or select another part of the text unless you click on another field first.
Actually if I click and/or drag on that original field enough times I can bring it back to life again and select something new.
I do have code in the script of the field that looks like this:
It works fine for me, though of course the selectedText is lost without some mechanism to restore it. If the list behavior is set, the selection persists, but that it not your issue. What you described is exactly what happens with the autoHilite set to "false".
So if you make two brand new mainstacks, and put a field with some text in one, and select some text, does the problem occur when you click on the other field and then come back?