This is similar to the blank page problem when clicking on the register link at top of home page.  When I click on the login link, it yields the User Log In page with user name, password, login button, register button, and forgot password button.  When I click on the register button it take me to a blank page.  I have a custom registration module with the page set in the configuration.  There was a ,"" left out of line 142 in the admin/skins/user.ascx.vb which I changed to get the home page register link working.  Today I notice that the register button on the login page is also going to a blank page.  Is there another tweak?

I upgraded from 4.5.3 to 4.5.5 and problem is now solved:-)