(Posting here because it is related to Classic, and also because the main UI and Macros forum doesn’t seem as active as I remember.)
Users of my XP Bar Text addon have reported being unable to click abilities in their action bars while the addon is active. I’ve tested this myself with just XPBT enabled and can confirm that it is an issue.
What I don’t get, however, is why it is an issue. My code - https://pastebin.com/9cLTpRCe - does not touch the action bars, so I can’t for the life of me figure out the problem.
Any assistance on this would be much appreciated.
Try enabling the error log and tell us what errors you are getting:
/console scriptErrors 1
It seems there’s something somewhere that makes Action bar actions “fail because of an addon” randomly. I have made the macro to off set bags and tooltips so as not to overlap the Action bars, and I sometimes get this error because of this, simultaneously I get the inability to move new items, spells or indeed anyting to the action bars.
I do not know if this is of any help as my knowledge of addons is very limited, but as a wise NPC says: Everything counts in small amounts 
It’s actually Depeche Mode 
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I’m not getting any errors at all.