Track Path is Missing

[big daddy]

Since installing Hoster 4.0 and now have upgraded all the stages to 4.6 I get an error on some songs Track Path is Missing. Have reimported the disks and have two systems and seems to do on both at times. I can check in shop working fine when get to show the file is missing error comes up. I use an external hard drive running XP and when I use backup hard drive same results. All hard drives are NTFS. Have have deleted the songs.mdb and rebuilt several times, seems to work once in awhile then will show the 'PHN00706-20c" track path is missing. Strange thing I just noticed when writing this is that the file name is PHN00706-307-20, with no "C".
Grateful for any help. Big Daddy