Hi!
Once an addon is loaded you get errors in the red-dot ui element and you can debug by e.g. writing chat messages or copying strings to clipboard. But what to do if an addon is not loaded at all?
Example: quest helper should give you a /ql slash command, opening a very good and flexible quest list dialog (you can see dependencies, to which quest line a quest belongs etc.). But this /ql never worked for me in CoA. 
I have CoA version of quest helper (9.1.1 from Apr 4, 2019), I now removed ALL other addons, restarted the game completely fresh and still /ql just says "nil". Now, the registration of this slash command is there (in ui_questlist.lua, listed in QuestHelper.toc). Similarly, if I comment-in the debug /qh section in QuestHelper.lua, typing /qh also just says "nil". So my guess is that quest helper is not loaded at all. But there is no red-dot button to see errors etc. (Note: the location of addons folder etc. is OK, if I unpack other addons there I can use them.)
So I have two questions
* any idea what I am doing wrong for quest helper? (Is it supposed to run if it is the only addon or are there some dependencies?)
* but more general: how to debug this kind of situations? (I guess, the answer depends on what the problem was; but if my guess that there was an error while loading is right: does CoA leave somewhere an error log from addons not loaded at all on start-up? If so, can I write to this log from an addon code?)
PS: Note: I have only been playing CoA for a couple of days now - I may be missing something very basic! 
