Q: These apps have already been accepted

Same problem here. After Yosemite update I ended up in similar situation.

I upgraded to Yosemite by the standard method (ie downloaded the updated and installed over mavericks) and have many problems with the mac app store since including crashes whilst trying to update apps. I too have imovie and iphoto asking to be accepted but get the error message these apps have already been assigned to your apple ID. I made the mistake of thinking that deleting the apps and reinstalling would fix the problem - then the apps were gone from launchpad and reinstalling via the purchases list just says installed with no way of opening them - UPDATE - I rebooted the machine and the apps did finally reappear. It seems the yosemite update process has messed up the mac store for some people as I'm seeing other problems being reported on other website.

Same problem here with iMovie & iPhoto

I am having the same issue with the same two apps.

Same here.

Yes, same for me, iPhoto and iMovie.

put me down for both too

Have the same experience with the Mac App Store telling me I have 6 apps to accept; then tells me that these apps have already been accepted as shown in MattAndersn screen shot

Same issue, with iMovie and iPhoto. For me the message actually seemed to interfere with my ability to update the applications. They wouldn't show in the Updates panel, so I had to manually locate them in order to update.

Same issue ...

I was able to accept the items successfully this morning. Looks like they've fixed this issue on the App Store.

sadly, i just tried again, and same issue with iMovie/iphoto. it did re-download the iMovie update for some reason (same exact version as yesterday) so i tried accepting again, with no different results.

Same here.

I also tried just now but still get the sam error, so in my case it's still not fixed.

I Should note that the two appear both in the "needs acceptance" and also below with all apps, and that both have updated and appear to work fine. Just that I/we keep seeing the "needs accepting" thing in the App Store app.