i just started using gatherbuddy to level up mining and herbalism and i have svn profile for it i start it at elwin im lvl 81 though and i put it to (GB2 1-75)(Elwynn.Alliance)Herb&Mining and i start it say tilemap is null and that i clicked the stop button but i didnt click the stop button aparently no log i put a log that is today and at the time i use GB2 no log i see something with the date of today and around this time but it say invalid file so i guess it does not have a log.
I have had this happen before. Generally reloading the profile fixes it. Does this happen every time you close and reopen HB and try running it? Also you might want to point us to what profile your using.
Go find the xml profile and right click it, go to edit. Once you are in edit look for <MaxLevel>86</MaxLevel> if it is 86 change it to 91. But this still might not fix your problem as GB is heavily bugged right now. Best of luck!