File Could not be copied, problem with temp folder

I was having the problem wit gsitemap as specified here:

http://drupal.org/node/144166

As this specified that the problem was fixed in later versions of the source code I upgraded to 5.x-1.x-dev and had this problem when running the update script:

The selected file XXX/tmp/file1yOGu2 could not be copied.

where (XXX) is the full path to my directory.

My tmp directory has ended up with the following files:

drwxrwxr-x 2 apache apache 1024 Oct 21 15:12 drupal.gsitemap.SESSda4bf696c0d1e186f328e82e24f12cf9
-rw------- 1 apache apache 275 Oct 21 15:12 file0MkKyl
-rw------- 1 apache apache 275 Oct 21 15:24 file1Hy9Xo
-rw------- 1 apache apache 11645 Oct 21 16:45 file1tphdW
-rw------- 1 apache apache 11641 Oct 21 15:55 file1uKUqi
-rw------- 1 apache apache 3642 Oct 21 16:34 file1yOGu2
(plus more)

The first folder above is empty.

Now when I try to request the site map I get a page missing error though the error is a bit distorted and is not a normal page missing page.