Airtime 2.0.3 - Cache folder grows and grows and old cache files are not automatically cleared

Hello,

everyday the HD of our vserver is full because of the pypo cache folder. It seems that pypo doesn't clear the old files.
So almost everyday I have to delete the files manually and then reboot the server.

It looks like pypo creates a new cache folder every hour with the same contents.
I attached two screenshots.

Image may be NSFW.
Clik here to view.

Image may be NSFW.
Clik here to view.

I also attached the complete airtime-log.

Thanks for your help!