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Is there a problem with the Hijack kernel?


No. But it does take up somewhat more space in RAM than the stock kernel. And when an upload just "dies" for no good reason, a likely culprit is running out of memory (due to bugs in the player software). So uploading without Hijack might possibly make a tiny little difference.

More likely, you just "got lucky" both times (different luck each time though..).

Cheers