Removed a few plugins and did the update to 0.6.1 and now nearly everything is working. Solr was returning zero results (not the error like before, actually reporting zero returned results) so we went back to DBSearch and it worked immediately. So using that for the moment.
YouTube plugin works again. Have not had email sends tested yet, they had been working on 0.6.0 but had not been working in 0.5.x for some reason, but had in 0.4.x. I assume that that is still working.
The Groups header is working again.
The plugin for the single image link to show is no longer in the list of available plugins, which is too bad, but that explains why it wasn't working. Would be awesome to get that back, though, as we have hundreds of posts that used it.
All in all we are working pretty well now, though.