Biggest issue thus far has been admin functions breaking due to invalid paths in forms. Couldn't save settings. Now can't export locations. Tags require a work-around if you have a space in your keyword. Other odd admin UI issues with js and CSS - wrong things displayed when clicking on the (?).
This is a real shame - this plug-in has a lot of potential. However I have received better support and found less issues with plug-ins that did not charge $15.00.