unfortunately yes, our forum has been hacked a few hours ago, with a few forum files deleted and the database emptied, by someone asking for a few BTC to restore it.
I managed to get it up again, and made updates to it, but we lost two months worth of data, and maybe some links/posted content won't be there. I know, I should have done more regular backups. I will now, lesson learned.
In addition to the data loss, asking for a ransom to restore the data means that the hacker actually stole it (possibly), so change your passwords ASAP, to be sure.
Last thing, I made the updates in a hurry, and I notice some things look weird. I will try to fix them.