I hate to say it, but so glad others see this - I thought I was going crazy. This is on 2 / 3 Instagram accounts!
This problem has been going on since 6AM CST today in Texas consistently for 2/3.
I tried: Chrome, Safari on Mac Ventura 13.1 (all patched up)
Windows Edge, Chrome - latest greatest patched
I deleted ALL cache, ran CCleaner on Windows (2x) and deleted all cache on Mac, rebooted, ran CleanMyMac 2x - no change
Used the DEV option in Windows & Mac to try various options - no change
This is amazingly persistent.
Interestingly, starting at 7PM CST I no longer get 2FA to my phone on 1/3 accounts. 2 others do.
The lone account that works just fine has the menu on the SIDE, not the top, of the screen.
If I could force the other 2 accounts to have the menu on the side, all would be good.
But, when did Instagram start putting a menu on the side? None of the 3 had that until today.
This is MADDENING.
OH: iPhone, iPad Mini - all work fine. This is only in Windows & Macs.