I have used Producteev for over a year now. I enjoy the iPad app and use the the browser interface on my windows and mac computers. I just became aware of this app for Mac OS and installed it. Two issues became immediately apparent. First, the user interface is not operating as expected. One example is that it is difficult to widen the left hand column which lists users, projects and labels. When I hovered the mouse over the vertical dividing line between the left column and the right column (where tasks are managed) the mouse did not turn into a resizing arrow. Clicking and dragging on that vertical line did nothing. I tried this a couple of times between crashes and reboots and eventually I was able to widen the left hand columnn so it was not cutting off the words. However, the mouse still did not change shape or behave in normal IOS fashion. I am an experienced Mac user (bought the first 128K Mac in 1984) and am proficient with software. Second, the app crashes quickly, everytime I tried to use it. Cannot do anything because it won’t stay running. When I clicked on the sort command it crashed. When I clicked on a person to list their tasks, it crashed. I can’t remember the other three or four different functions I attempted to used resulting in the app crashing. My Producteev database is VERY SMALL. Only one user, with about 8 projects and only 6 or 7 tasks per project. I’m running an updated install of El Capitan on a MacBook Air with intel Core I-5 chip, 8 gigs of RAM and a 256 SSD. I hope Producteev can get this fixed. Till then, I’ll go back to accessing Producteev via the browser interface, which works extremely well.