BUG: Uploader crashed while uploading a JPG for character avatar

Thanks for the extra information. This sounds like a image upload timeout. This happens sometimes (though rarely) when uploading a large image, or when the internet connection between you and our servers is momentarily slow. This should be very unusual, but if you notice this happen again please do let us know. And thanks very much for reporting it!
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Anonymous commented
There was a generic error message (something like "Oops, it stopped working, please use the feedback button to tell us about it.").
After closing that window, hit the feedback button and submitted the bug report.
After that, I reloaded the page then hit upload, and the JPG loaded fine.