So far I've found two things, not sure if they've been mentioned before so I figured I'd mention it.
Firstly, for the Master/Worker function, I've noticed after the worker sends out the trade request, and the master accepts it, before trading over the essence while in the trade screen, the worker account clicks the Run orb and then has to send the trade request again. Not a big issue, just a pattern I noticed that may trigger something as its not something a real player would ever do, and has gotten a tad annoying.
Secondly, on the run back from the Nature Altar to the shop to un-note more essence, it seems to get stuck rather often. I have tried it on every 'walking option' other than the Abyss one. I've tested it for about 2 hours and it's happened at least 5 times where I either have to just click where the mouse is already hovering for it to register and continue. Or reset the script all together. I noticed it happened North of the teak tree area 3 of the times.
I don't believe there is an error message.
Other than that I'm loving this, and will more than likely be buying it in a week or so if there's anything you can do about those issues.
If there's any other info I didn't think to mention let me know xd.