Upgrade Issues

Upgraded to the latest version, and now getting this error directly on the page the shortcode is placed:

“Failed to create cache path”

I’m hoping this is just a permissions issue, but to what? And why all of a sudden? Where is the upgrade documentation?

I had to go back to the older version, which was a pain, because to get it back to working, I had to restore a complete site backup. What a pain.

Any ideas?

http://wordpress.org/plugins/tubepress/