Login/Logout goes blank instead of reloading page

[doctorbull]

I just installed the 1.0.7 update, it was super easy.  Then i just installed the Neptune theme pack, ALSO GREAT!!  But a slight problem occured somewhere during the process.  Now when ever i log in, the page goes blank instead of reloading the main page with me logged in, but then if i hit the back button and reload, then it shows up as being logged in.  The same thing happens when i go to log out.  I hit the logout button, the page goes blank and does not reload the main page with me being logged out unless i do it manualy through the address bar.  Did i do something wrong, or is there something in the programming i need to change?  If anyone can help that would be really helpful!!  Thanks!! is anyone else having this problem or experienced similar?

[doctorbull]

just as an update,  i switched the theme back to the default and it does the same thing, same problem...