Repairing permissions rarely fixes a problem, so no surprise there. What happens if you try to sync with no items in your calendar, and quit out of datebook in the Razr?
Is your RAZR just a V3? iSync lists all kinds of V3 RAZRs as compatible, but none are just "v3"
Motorola RAZR v3 (GSM)
Motorola RAZR v3i
Motorola RAZR v3c(4)
Motorola RAZR v3x