Apparently (according to actual admin there) the MAWS scripts were used to hack the server, and use it for sending spam.
Due to the severity of the hack the hosting company have kicked them (the whole of Mameworld) off as a result, it isn't just a case of non payment this time.
It's gone, possibly for good.
Note, given that MAWS isn't just a generic piece of software running on the server like the forums or wordpress were this would have had to be a deliberate targeted attack against MAME / MAWS not some generic attack relying on outdated installations. That's probably another reason the host pulled the plug.