Anyone having trouble with Kit Broadcast?

My assistant uploads my newsletter monthly to Kit with no problem until this month. She says she can open a draft (she duplicates the last newsletter and then edits it) but can’t edit. I’m on their free account but well below the maximum number of emails allowed.

She says her browser is up to date (she’s tried Firefox and Chrome) and has nothing unusual like a VPN. I am able to get into the Kit account on my computer and edit the draft that she created on her computer.

Any suggestions of what we should look for as we troubleshoot this? Thank you!