I've had Verizon FIOS for as long as I've been a member of SR and I haven't had any problems. (Well with the FIOS vs crediting, doesn't mean I haven't hit a dry spell with offers though)
The only thing I would check is if you have a seperate firewall with the FIOS that may be blocking/changing your cookies. I had that with comcast before and it was a double layer. We use Norton so I took the one from Comcast off and just use Norton.
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