D-Link DIR-625 Wireless Router is Blocking Web...

Question

I have a D-Link DIR-625 Wireless Router. Today I cannot access a specific website by browser, ftp or ping on any of the three computers in my home network. When I disconnect the wireless router and plug my computer directly into my modem I have normal access to the website. No other website seems to be 'blocked'.Is there something in the D-Link firewall which would begin blocking a specific web address for some reason?Any help is appreciated.John