So I started getting this issue just recently as well, just after I updated to the most recent cutetube with feed integration. I tested it and it seems to be causing the issue, uninstalled and feeds are updating just fine after reboot.

With it still installed. I tried a simple reboot but feeds went back to hanging and not updating.

Let me know if this makes any sense, but it worked for me, if anyone can confirm it would help too

I am more than certain that its causing some conflict with the feeds.