Two things, an issue where users were unable to log in was reported. I am fairly sure it is now fixed, if anyone else has the problem, can you clear your cache first, and if that doesn't work, please drop me a mail [email protected]
Secondly, you may notice the URLs have changed, if you have any link bookmarked, it should redirect. Cleaner URLs help with SEO, and allow people find content from search engines (in theory at least!).