Major Problems with upgrade. [Integrated]

First of all, it looks great. and 99% works. BUT, the things that don't... well, it's a problem.

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Solution has been fully integrated

1. Email still doesn't work. I have verified that sendmail works, php is configured properly, and a php script can send mail from my server. However. YACS doesn't.

2. Tabs stopped working on the control panel page, which makes the page completely unuseable.

So you know, I also tried a completely clean install of the software (other than the database) And reset every single parameter and used the default skin. To no avail.

Any help would be greatly appreciated, my site is ready to skin me alive.