OK, so I tried burning an .iso to CDR, like I've often done before, also with ImgBurn, but I had to try 3 Verbatim CDRs (non fake) and only the third was successful, after I did a "Try Again" in the Verify stage. Here's the error-log:
I 15:44:12 ImgBurn Version 2.3.2.0 started!I 15:44:12 Microsoft Windows XP Professional x64 Edition (5.2, Build 3790 : Service Pack 2) I 15:44:12 Total Physical Memory: 1.046.848 KB - Available: 625.172 KB I 15:44:12 Initialising SPTI... I 15:44:12 Searching for SCSI / ATAPI devices... I 15:44:12 Found 1 DVD