I tried pushing exactly the contents of osx-universal again to the same channel, and it worked fine:
I did this test from Linux though - if you're uploading some Windows and there are symlinks involved, things might be different.
I have additional questions:
- Are you pushing a folder or a .zip file ?
- How long does it take for butler to fail with "unexpected EOF" ?
- What's the CPU usage like while you're waiting for it to finish? Close to 100% or close to 0% ?