Its a good bet that Ims is using the file: protocol to test his code.
I usually work on a server, and have had no troubles with any of the Chromes and their styleSheets methods.
When I opened a page from the file system Chrome was the only browser that would not expose some of the styleSheets rule sets, although it could find every styleSheet loaded.
It seems to be a file permissions weirdness, though not even Safari 5 shares it.
Test your code on a local server with http: instead of the file system. It's the only way to use IE without getting a migraine, but all the browsers are really built for http.