WP 3.x Mult-Site Move Question

Hi -

We just did a site move from one host to another and have a couple of questions.

1) Anyone have any issues after a move with connecting to the database at the new host?

2) Are there any specific issues with plugins from WPMUdev.org associated with a site move?

3) We have been seeing an "important updates" message in admin. for WPMU plugins, but when we click on the link given we get a page not found error. What could be causing this?

Thanks all.