Unusual update problem

[ChrisJones]

i was not aware of a problem until too late.

when 1.0.3 was released i updated mine straight away, yes a long time ago.

anyway i just updated from 1.0.3 to 1.0.5 & became aware of my problem.
i dont know how i did something wrong - but im fairly sure it's my fault.

problem being all websites being redirected to the admin login screen.
if i use a specific page ..i get a 404 error.

i removed one of my domains & then re-added as a blank domain & still re-directs to admin login.

help pls