You might flush your browser cache for the router and try again. If that doesn't work you could try another browser.

http://placeshiftingenthusiasts.com/

There is a new update today 77475.5 http://www.4shared.com/dir/v1BuINP3/Toastman_Builds.html#dir=105920660 You may want to try it.

I don't see anything in the read me file that mentions what the changes are but maybe he hasn't gotten to it yet.
Don't forget the warning in the read me... 'WARNING - DHCP IS DISABLED BY DEFAULT. DON'T FORGET TO TURN IT ON IF YOU NEED IT.'

http://placeshiftingenthusiasts.com/

I honestly have no idea about this - I can't reproduce it, although periodically I see people post this question about every other Tomato mod also. One common thing is that people report only some of their clients suffer from the problem, when one PC can't access the router, usually others can. Often rebooting their PC has made it work. All that points towards something on the individual PC concerned. (There was one possible cause in the router firmware(PAWS check) but I removed it altogether).

Did you try different browsers, clearing caches, etc... ?

http://www.toastmanfirmware.yolasite.com http://www.4shared.com/dir/v1BuINP3/Toastman_Builds.html