Can't restore job state due to data type mismatch:

Good'ay and Hello,

I've been a big fan of dvd::rip for quite a while and have been using it 
without problem for quite a while now.

However recently I have come across the following message when trying to 
start dvdrip-master.

"Can't restore job state due to data type mismatch: Job type=group, Data 
type= at /usr/lib64/perl5/vendor_perl/5.8.8/Event/ExecFlow/Job.pm line 478."

Let me give you the quick story:

The cluster control showed that a handfull of dvdrip's failed to encode 
to xvid one night and rather than address the issue I just turned my 
machine off.

The next day and I always do I did a emerge --sync updated portage then 
did, emerge -av --update --newuse --deep world. Looked to see if there 
was anything that needed updating that I wanted to update (I beleave 
part of gnome wanted to update) decided to allow it then wandered off to 
get my morning coffee came back everything compiled and ready to start 
the day.

I'm not implying that caused the problem, it's just the last things I 
remember doing before the problem occurred.

I have tried googling the problem and searching the mailing list but 
haven't been able to come up with a solution.

Rather than post all sorts of logs, system specs etc I'd rather you 
asked specifically what you require to help.

I'm hoping this is just a silly problem that I've cause my self.

Thanks in advanced,

Laurence