apparently they moved to a new platform yesterday:
https://reclaimthenet.org/new-gab-decentralized-version/
I get the main page at gab.com to load but my account does not show up, just a new registration page. Gab.com is down according to three site trackers.
I’d be a little cautious about the possibility of fake or phishing sites as Gab would be an ideal target for hackers.
and then after some machinations, it allowed me into my old account. Give ‘em some time to work out the bugs.