I have been doing a lot of research on this as I'm having the same problem on my 2008 SERK. Brought it to a local guy who told me he wanted to look at the starter first, start with the obvious he said. He pulled it out and one of the gears was stripped. Had it rebuilt, put it in and the same thing happemed! I had originally brought it to him to have him change the ACR's so I said ok, lets now do the ACR's.
We pull it apart and he decides to test the ACR's that are in it on a battery and they work fine, he tests the new ones and they work too. He then says I have a wiring problem. When you push the start button my bike loses its ground. Unplug the PCIII USB and run it off the factory computer and it starts fine.
I made a post about this and only got one response but it turned out to be a good one, seems as if some power commanders were shipped without the ACR circuits in them. I called powercommander and they told me to ship it to them and they will check it out. If they are not in there they will put them in free of charge. So after Laconia I'm going to ship it to them and see what happens.
If its not fixed then I'm going to have to wait and see what the 2011's look like
