I've seen that, but very rarely. Make sure you have one of the later firmware releases (I believe there was an opera upgrade in one of the earlier upgrades this year). Also make sure you have javascript enabled (it's unbelievable how javascript can be mis-used by web designers). Finally, if nothing works, try MicroB. I have to use MicroB on a few specific web pages, including the web interface on one wi-fi router I own. The symptoms are somewhat similar to what you describe.