travelin_cat - 12:30 am on Jun 17, 2011 (gmt 0)
In Site -> Global Configuration-> Server -> Server Settings, what is "Force SSL" set to?
If it is set to "Entire Site" this may be your problem. You would have to set it to "None" and then manually go in to each Menu link and go to Parameters (System) on the right and Enable SSL for each menu item there.
This should make only the pages linked to from your menus SSL.