I can't pinpoint what is going on yet but here is what is happening. Some .koc file, when uploaded, result in the following error: Syck parser (line 2435, column 8): syntax error at /usr/lib/perl5/YAML/Syck.pm line 72 It seems that the entire koc file is serialized as YAML at some point by C4::BackgroundJob, and it doesn't like the data.
Kyle, do you know if this is still valid in current versions? (filed 2012)
Since we've moved away from YAML::Syck, this one is invalid I think. Probably not an issue these days anymore anyway.