I am using a Sony Ericcson w8 Android phone. I am unable to log in and load a web page (like Google, GMail, etc.) even after selecting "clear cache." There is just a blank screen with a progress bar.
I assume your selecting Browser > Menu > Settings > Clear Cache ?
You can also try clearing the full app memory from your home screen (outside the browser):
Settings > Applications > Manage Applications > Select the Brower App
Choose 'Clear Data' and also 'Clear Cache'.
If all else fails you could also factory reset the phone.