Thought maybe it had to do with expired gold account status, but renewal didn't seem to help. I can see the shops under the drop down menu, but they have little caution triangles next to them. I can't access my shops from any other place on the site. The "Your shops" section says I have 0/6 shops, I have 3 actually. I have a pretty significant collection in those and I'm a little scared I'll lose that. Any steps I should take?

Check out this guide!

Ahhh... Thanks! So the shops gave been updated or something?

Yep, new format kinda, and some quantity limits (unique, not total), to help with server strain.