There's absolutely nothing wrong with Tabber. It's perfect for 1.1, not using any deprecated functions, and is using jQuery and not $. I honestly would not even begin to know what to change.
As a matter of fact I actually use Tabber on my own site with zero issues. Also nobody else has reported any issues with Tabber, so I'm going to say it's something in DMS. Maybe one of the 235 js file that's loading or something. Tabber has been out for nearly 2 years now with zero issues.
One last thing...Tabber is Bootstrap Tabbed content with some wp queries for content.
I couldn't log in to ANY of my production sites, and ANY of my local sites. There are twitter users who were experiencing the same exact issue. I definitely don't make these things up. I don't actually have the time to come up with stories. If it happened, then it happened. Is what it is, so time to make it better.
To be quite honest I'm pretty ticked off that i can't even load wp-admin. This should have NOTHING to do with the status of pagelines.com Period. If PageLines .com is down, it shoudl NOT affect any install from loading.
I checked 15 sites. I can't login to a single one because PageLines.com is down.
edit - 9:00 - everything is back online - was out for a few hours which means my stores were also down and prevented anyone from making purchases. I'm assuming this is why the store is removed in 1.1 - honestly that's a good decision. https://github.com/pagelines/DMS/commit/78e40655a64ea09077940ef03bac30a36d062ba9