Hey Luis,

It sounds like you may have a corrupt file(s) in your library.
I would suggest analyzing your entire library using your current version of SSL.
Know that various versions of SSL handle corrupt files differently.
One version may not have an issue with a file while another one will.
That is why we suggest you reanalyze your entire library anytime you update to a new version.
You do this by unplugging your Rane hardware, holding down the ctrl key, and clicking on the 'analyze files' tab.
Once its done analyzing your files look through the 'all' section for any corrupt files.
They will have an icon next to them that looks like a cd with a crack down the middle of it.
If you are having SSL read your iTunes library and you see any files with corrupt iTunes logos next to them you'll need to jot them down, shut down SSL, open iTunes, delete them from iTunes, and then re-open SSL.

Once your library is corrupt file free give it a good test run and let us know if you are still having issues.