1. Remove conflicting stanzas
Check if there are conflicting stanzas and comment them out or delete them.
When there are multiple stanzas for the same domain / host name, EZproxy may choose the one that has not been changed.
For example, if you adjusted a stanza for example.com, check for other occurrences of example.com in your config.txt.
2. Clear the browser cache
The old, unproxied version of a resource (HTML, JavaScript) may still be in your browser cache.
Clear the cache, close and re-open the browser to make sure nothing is in the cache.