AlexNeiberg Hi, I too had a desktop stargazer 1.5.3 and I could not send because the signature page was not working. The solution for me was to download the stargazer wallet mobile app which is on a newer version. When I tried to export the desktop account to the mobile app I also did not see a QR code. For some reason, when i clicked on the use private key, then exited that page, a third option to use QR code showed up !!😮
I was then able to import the account using the QR code to the mobile wallet, and the send functionality worked just fine.