Adding: When I go to Media and upload images there in the multi-file uploader, it uploads and says it is crunching, but never finishes crunching. But if I use the browser uploader instead, it actually works.
@websydaisy – Do you see the same issue if you temporarily switch to a default WordPress Twenty series theme?
– Cais.
Same problem with stock theme. I think compatibility problem with new version.
Yes, what lupet92 said, theme does not seem to matter.
@websydaisy – Do you see the same issue if you use a default WordPress Twenty series theme and start with NextGEN Gallery as the first plugin you re-activate?
– Cais.
Yes, I tried that and it still has the same issues.