Joomla 1.5 & Superfish: blank page after adding menu item, menu items cannot be moved, sub menus acting funny

Joomla 1.5 & Superfish: blank page after adding menu item, menu items cannot be moved, sub menus acting funny

Any help with my problems below would be greatly appreciated.
 
Problem 1
Adding a menu item to my Superfish menu causes my Joomla 1.5 site to go blank. Turning on debugging a error reporting still results in a blanks page. Viewing the source is also blank.
Total menu items in main menu is 35 (including sub menus)
 
If I remove the newly added menu item the menus come back. If I restore the new menu item, disable superfish and use the default text Joomla menu the site works fine.
 
Problem 2
I cannot seem to move ANY newly added menu items up the list of my Superfish menu.
I.e. I want the About us menu to be the second menu listed. It shows that way in Joomla (correct order number) but never moves from the last spot (horizontal menu) on my page.
 
Problem 3
If I click on a menu with sub menus the menus on the resulting page do not behave correctly.
I.e. on the home page the menus have the down arrows and fade in and out as designed but once the menu with subs has been clicked the resulting menus have no down arrows and the fade disappears. Also, the menus are very twitchy and cannot easily be clicked.
This occurs in IE8.  The menus work fine Firefox 3.5.7 but still lose the fade and arrows feature once a sub-menu has been clicked.
 
Any help would be GREATLY appreciated!!!
 
Site can be found here:  http://gator1135.hostgator.com/~dvhaa/
 
David