error message at checkout

[mic]

First post here
I have installed prestashop and been playing around a bit with it, i really like this shop.
But when i put some products in the cart and try to check out there is somekind of problem.
Everthing is fine until i try to select the payment method, i have three options available, paypal, postförskott(payment at delivery) förskottsbetalning (swedish module for payment in advance).
Paypal works, but with the other two i get this errormessage:

500 Internal Server Error
The request was not completed. The server met an unexpected condition.

72.29.68.220/~mbimport/modules/cashondelivery/validation.php (port 80)
Please forward this error screen to 72.29.68.220's WebMaster.


--------------------------------------------------------------------------------

Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at 72.29.68.220 Port 80

Anyone that has any ideas of why this happens, and a solution to the problem would be very nice =)

[mic]

I found the solution, and maybe it will help someone else.

The hosting service im using have started to use SUphp so the permissons cannot be set to 777 anymore, only 755 is allowed.
After changing this all is ok.
Hope this helps someone else

[texxo]

I did also the same thing.
Whatever was in the installation guide to be set as 777 i have set it to 755.
Also the recursive cases too.

All works OK now!