Problem with Record Now Max ver 4.5

[brkr101]

I have a Sony DRU500ulx, Record Now Max ver 4.5, Win XP and use Ritek4x media. I just got this version of RNM and copied about 10 games w/ no problem. All of a sudden, it can't read the blank media. I keep getting error message "Insert blank media". I tried about 5 different discs (all Ritek 4x) and same problem. I used to get this problem with an older version of RNM but ever since I got the new version about 20 days ago. I haven't had a problem until now. I tried restarting, unistalling and reinstalling my drive too. Any suggestions?