I'm getting the following errors when I take a look into the control panel:

Warning: <mydomain>/public_html/administrator/cache/84b083723ff96a2ba1e61ac2bb7bb7dd.spc is not writeable in <mydomain>/public_html/libraries/simplepie/simplepie.php on line 1779

Warning: <mydomain>/public_html/administrator/cache/84b083723ff96a2ba1e61ac2bb7bb7dd.spc is not writeable in <mydomain>/public_html/libraries/simplepie/simplepie.php on line 1779

I found the following topic where someone seems have to same problem: www.artio.net/support-forums/joomsef-pay...url-generated/page-2
But turning Joomla cache on or off doesn't make any difference.

I'm working with latest JoomSEF 3.6.5
Joomla 1.5.18
FTP layer turned on, host is setup that it wont work in any other way.

Any help is greatly appreciated!

Had a fair amount of mail correspondence with the host and eventually they sorted it by doing a recursive directory ownership reset.

Errors have gone away and it all seems to be working.