I seem to have problems too..
Adding a Mega2560 with WIZ5100 chip won't connect first time to the server.. Server says it is not online.. Had this unit already running under my other account. But have to put it in this account so my co workers can't acces my home control (** We really need that user level possibility....)_
Also if i look at our other unit (Same hardware as above.. Same network) from my iphone i can see the status of the I/O 's But on the website the I/O's are greyed out.. (Win 7, Firefox)