Is he using his own computer?

Some work places have varying "policies" about internet use.

I was out of town and had an hour to wait in someone else's office who had internet access, so I thought I'd catch up on my turns-- but I would get into the site but when I tried to access my first move, then everything would suddenly go blank-- it seems that company bans "games" on their work computers and when the system recognized that this was a gaming site it shut me off from accessing it.

Just one possibility.