Sounds like a one-time occurance to me. Whatever was wrong got cleared up, and the same upload would probably work with or without Hijack installed at this point.

If it were an issue with Hijack, more than one person would be having trouble at this point.

Note that Hijack has no code along the paths that were failing, and the "bug report" didn't include anything useful like a serial port log, which would have more clearly identified the culprit.

Cheers