I've been trying to sync my sets to Brickset several times in the last 3 days. I do that from the "my set lists" page.
I always get the same behavior:
After I key in the credentials (I ticked the "remember me" box), the login screen just stays there, but nothing seems to happen. I only have 37 sets, so even if you'd not show some kind of progress bar, I would not expect the sync to take several minutes.
The login hash seems to be remembered, though, because the next time I clock on "sync sets to Brickset", I get a screen that asks me start the sync (and shows some warning). However, once I start the sync, I get a red error box reading "invalid login hash".
I've tried this on the latest versions of Safari and Firefox on macOS 10.11.6, with and without add-ons activated. Unless there's some Flash thingy being used, I'm positive there's some issue here. Also note that I'm new to rebrickable, and I have thus never synced my set list to Brickset so far.
Anyone else experiencing something like this?
Thanks for your help