Still happening the exact same thing with me, I write the reply to a post and when i'm going to post it it ask me to login and i'm redirected to a blank reply section again.
I'm not sure what could be, but started after i redefined my safari. (actually now is a little better in the sense that is not every time i reply that it happens) ...
Yes i tried the forever login too. And my browser is updated.
I tried restarting my router and computer some times. I thought the problem was here cause when i redefined the safari the energetic forum also happened the same problem but now ceased.
maybe is the network... don't really know