I don't use phpmyadmin but I debug alot of my own apache stuff. What's the access and error log say? Did you try with your ip address too? if you have access rules you might've disabled access with the localhost word thing. Check logs with something like this.
Code:
clear; tail -n 0 -f /var/log/apache2/{error,access}.log | while read input; do echo "${input:0:200}"; done
Then with the command running goto the page in chromium and make it error, then ctrl+c in the terminal to stop the command.
Is it a cache problem with chromium? did you try firefox?
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