BarFly doesn't care what end-of-line character you use. MacOS does use a different one to Windows, but it shouldn't affect anything after uploading text to a web forum and downloading it again. Those invisible characters that aren't spaces are more of a problem; MacOS and Windows agree on what a space is, so this shouldn't be happening. Mudcat is doing something very weird here.

I'll check with a different browser, that might also affect it.