Hello
Error 2338 could also mean Windows error 146 (Converter error logging is far from perfect). According to http://wefixerrors.com/error-code/error-146.html you should check your machine registry. Quite possibly a red herring, but worth trying.
There is also something pretty strange - the log from the failed conversion contains a vast amount of spaces (0x20) when dumping the source info. Has the worker service crashed during this failure? Or anything else unusual?
Regards