Good to know, thank you.
Judging by the wide range of issues I've been reading about the past few days about DUE-uploading in general... whenever Windows is involved, there could easily be a dozen reasons (simultaneously?) why it's not working. I just happen to come across a "solution" for my setup (for now). Hopefully nothing else will crop up.
I don't mind the time it takes for a successful upload... but I'm annoyed that the "upload" button causes a nearly complete re-compile every time. I also tried using BOSSAC independently outside of the IDE, never got that to work at all, unfortunately.