Web 2.0s Tumblr Slow/No Index?

Newb here on BHW, but doing this a while.

I routinely build web 2.0s and haven't had a problem before with getting them to index (either from scratch or using expired Tumblrs). My last crop of 4 web 2.0 properties haven't indexed at all (going on 4 weeks now). I haven't done anything different, have put up good content and sent social signals to each. Nothing.

Is anyone else expiring difficulty in getting expired Tumblr's to reindex, or very slow to index? I'm baffled.