You need the 'fix_cache_key' module from the downloads section.
It's only one file which you upload to the same place as your "ipn_main_handler.php" file. Then load "fix_cache_key.php" in your Browser and problem should be solved. Remember to delete the "fix_cache_key" file when done.
That was the first thing I tried. It didn't work. I think this has something to do with the way Vdeck has their files set up.
[HTML]Warning: main(): open_basedir restriction in effect. File(/includes/autoload_func.php) is not within the allowed path(s): <---the start of the problem(/home/fionasfr/:/usr/lib/php:/usr/local/lib/php:/tmp:/var/tmp:/home/vdeck/tmp/:/usr/local/bin/mogrify:/usr/local/bin/convert:/usr/sbin/sendmail) <--- the problem[/HTML]
I do know that this host will run a Zencart as this is an upgrade from a previous version. THe only thing I know else to do is a clean install. but I have never seen this particular error before