Me too. Just dropped my milkers and collectors back into my house. Will check again after office hours to see what happens. I also have two feeders, and yes, my first feeder (the one nearer to the pen) was almost empty, and a quarter of the amount in second feeder was also spent. It seems the piggies are hungrier now.
I put all of mine out again and, though they appear to be collecting more slowly, they do appear to still be collecting, and yes, the additional ones have been collecting when my first one fills up.
Midnight, file a bug report. A few other users have already reported that, though, so check under the list on known issues. If for some reason it isn't there, then go ahead and file. Otherwise, know it's being looked at and should be fixed soon. :)
fwiw, if you pick them up and can't drop them again, I was able to drag and drop mine into my closet... was strongly hoping they'd start working again so didn't want to risk losing them...