Try this...

[Anonymous]

1.  Delete cookies for TIU.  Try now.
2.  Empty your browsers cache files.  Try now.
3.  Try another browser.

The problems are user based on your side of the client browsing.  For most people the delete cookies and empty cach usually works.  Some people need to use another browser.  I do not know why these problem are occurring, but are the result of taking the previous hosts DB and putting on the new host.  There is a conflict now with browsers of users who have previously been to the old host.  I hope you can access the site.

Ognir made this suggestion:
In Firefox, press Ctrl Shift + DEL
Delete cache and cookies, finally got mine working again

Peace.