Hi,
I'm experiencing very strange problem with my WL-500g Deluxe. It was running quite well until a week ago. From that time I can't get access to some web pages. When I'm not using router (so I'm directly connected to the modem that my internet provider gave me), everythink works fine. However when I use router, I can't get access to some servers (some other servers, that I use often works fine). In my opinion is this problem somewhere in DNS, but I have really no idea what to do with it.
I have tried the change of firmware (currently I'm using Oleg's WL500gx-1.9.2.7-7e) to ASUS firmware (WL500gx_1.9.6.0_EN), I have tried also reconfigure the whole router but no luck.
Any help would be really appreciated.

Thanks

P.S.: I might have something forgotten so any questions will be welcomed