Hi, I'm on here today because I have the same issue.

I can print labels for my own customers without any issues however when I tried printing a return label it flashed then closed the app. I logged in on my laptop and the item shows sent and in transit. I have a tracking number however cannot print a label.

I was hoping not to have to go seek assistance from the post office - the old lady up there is very snappy!

I've never had this issue before and I'm wondering if it's because the label is 2 pages. It's the only differing factor that I can see.