In case you've been trying to log into the OctoPrint forums since this morning and couldn't, there's currently some outstanding issue to solve with a needed software update. The admin team is on it and doing their best to resolve things ASAP. The forums might be made read-only again for this, or even go down fully for a short time. Thank you for your patience while this is being looked into.
Edit: The issue appears to be resolved, if anyone is still having issues logging in, please contact firstname.lastname@example.org.