Gametop.com

For years I have been using gametop.com for some quick, casual games.   Last time was yesterday.   Today, after a brief session I logged out of the game and, instead of going to the gametop site, a Norton warning came up advising this was a dangerous site, and recommending I do not visit it.   This now happens whether I use a game or try to visit the gametop site directly.   Anybody else having a similar problem ?