Yes and yes. Do the footpockets fit well or are they too tight? Normally I wear one size larger and 3 mm neoprene sox. Never a problem. Cressi footpockets are among the softest in the market. Probably not the right size for you.
Cramps in that area are usually caused by footpockets that don't fit well. This is probably what you're feeling.
With the Cressi fins you don't have a choice, it is what it is. That's why guys choose any of a number of footpocket brands available on the market that will fit them best, and then choose blades to match the footpocket characteristics, to get a fin with the desirable flex and stiffness. Carbon blades being lighter than anything else help to relieve stress from knees, ankles, instep and toes, not only the arch.
That happens occasionally to me, I grab the tip of my fin and pull it towards my hip, stretching the bottom of the foot. I notice it more when I'm dehydrated or finning very hard or both.
*Disregard* just saw your follow up post. Mine always happen where Dan's photo shows, never closer to my toes.
I get a pain on the top of my foot. I think it has more to do with suction on the sock as dan has postulated.
I still think mike it right about dehydration. I don't cramp until I am tired and have been diving a while
Exactly, suction between the sock and footpocket. I don't like socks and avoid them if possible. I'd rather be cold than get that feeling of a cramp coming on whenever I try to stretch out my foot/wiggle the toes while wearing the fins.
Frank,how many times has it happened?
The fin may be too stiff for you. A lot of people that buy the 2000's end up returning them for the 3000's which are much softer especially on long shore dives.
I'll try no socks if I go out this weekend. It doesn't happen much at all, I usually go out on a boat so It's 30-60 minutes swimming jump back on till the next spot. This was my first time swimming off the shore and staying in the water for 2 hours straight.. I went with forum member Alan, he's also a much stronger swimmer than I so maybe I over worked a little.. Today I wore my fins at home without socks. They do seem tight to me. :\ I've had them over a year, a little late to return them 
Bring some socks just in case. The fins could get you blisters if you are not used to wear them alone.
Good advice always better to be prepared. He might be fine though. . I have dove w my older garas barefoot many times with no bad results. They have very soft rubber fp's.
Nothing will change the the shape of the footpocket other than cutting it, and you don't want to do that.
There are a few footpocket brands to choose from, you should be able to find something that fits well.
I had the same problem with neoprene socks. With lycra socks I am fine but when I go to neoprene instant cramps like you Frank. The suction is what causes it for me. So I decided to break the suction by burning many holes in it with a fine nail. It works fine and I prefer neoprene now.
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