I also had a problem with distributed CEF on my 7500 running 12.2(8)T10. There are 3 VIP blades in the 7500, one with 2 FE cards and one with a single FE card. The other VIP has a serial card for 8 ports with my two Internet providers attached to this card. When I enable dCEF I loose Internet connectivity to these providers.
There appears to be a bug or a configuration missing with dCEF and the 7500 with certain versions of the IOS. I would be curios to know a resolution to the problem.
Jeff