After updating our site to 5.4.2.1, i get page not found error when navigating to other header pages, however if i took the word concrete out of the URL it seems to find it
e.g
www.www.mydomain.com/concrete/services... : page not found
http://www.mydomain.com/services :works

also, it's not displaying the logo on the header any more even though i copied to the new /concrete/themes/default/images directory.

i had to restore 5.4.1.1 folder to get it working.
any ideas ??
thanks