Merch Designer Broken?

Trying to get onto the ED merch designer here:

Not getting any further than the spreadshirt logo on the screen... have tried from three different devices now (two desktop computers, one mobile device). Have also tried multiple browsers (Edge, Chrome, Firefox etc)

Anyone able to confirm if they can get on it?

For information, have disabled all adblockers and stuff, if that's the cause?
That uses Spreadshirt, doesn't it? Spreadshirt's making some big changes to their shop system this month that will break sites until they're modified. My own carnage is coming toward the end of the month.
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