Move your cache from the hard drive to the USB stick. Don’t copy it – move it.

 

When you keep your cache on the hard drive, the same one is used for customs/TU4 play and online/TU5 play. That gets messy fast.

I echo Nyx’s comment 100%… I had /exactly/ the same problem you are describing and moving the cache fixed it completely.

Online mode: USB stick contains song cache and Title Update #5

Customs mode: stick contains song cache, Title Update #4, and all custom songs

Works like a charm.