It is FOOBAR! I've just done about 200+ of these, here's a few tips I learned:
1. If warned that 1 or more tracks had issues, your disc ISO may still work. Open the ISO in FOOBAR and Convert ONLY that missing track. Then you have the full album intact.
2. When it's working at snail's pace (0.00% for whatever reason), cancel the album conversion and Convert single tracks. It seems to work very quickly on troublesome ISOs.
3. Don't be running MP3 Tag or MMH at the same time as the FOOBAR ISO Convert they battle for resources at times. (I do love to multi-task but Convert is a hog)