Or not, it's actually a bit strange. I start the process of evaluating a disk and the same message pops up indicating you can still use the app, but then the log message "Evaluation period has expired, shareware functionality unavailable. Failed to open disc"
The odd thing is, according to the About screen my version doesn't expire until July 18.
I've re-installed and tried disks that had previously been ripped, all with the same result.