Same here. Guiding worked fine with my CGEM II prior to 1.5. Seen a couple of workarounds that seem to help me some; make sure your slew rate is set to 1 on the preview page. Also calibrate each time you setup a new auto routine.
Still having problems with polar align as well but that's not new in 1.5. When the ASIAIR Pro commands the scope to move 60 degrees it goes haywire and will crash it into the mount if you don't stop it. I've had to "manually" polar align with it since I got it a few months ago. 1.5 didn't fix that issue with some Celestron mounts.