The uploader mess finally affected me. I happened to see a Red Error message that disappeared I captured it and have submitted a detailed support request
I played around and below is something that worked for me as a work around for now.
When the Uploader screen opens make it full screen before you do anything else
Next pick your pictures as you always have
Lastly press Upload and hope
It worked 3 times in a row for me that way. Please note you can’t have tried an upload with the default screen that pops up and than make the screen full-screen as that will cause the same red message to appear.