I often get an error that tells me to enter only numbers when that is exactly what I am doing. This was with the old site and is still happening with the new site. This happens when buying/selling stuff on the exchange and when creating a new chain. Other than that I found one new problem, choosing which chain to mine and upgrading a rig doesn't seem to work in Google Chrome. Works fine in Firefox.

The game itself.. The idea is very interesting, it could be a lot of fun. The biggest problem the game has right now is in my opinion that rigs and upgrades are way too cheap. There is really no reason for anyone not to just buy a few dozen rigs and instantly upgrade every rig to maximum.