Postnuk only problem

I cannot upload pictures ONLY when using postnuke. If I navigate to the gallery from my postnuke page and then attempt an upload I get:
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Processing status...
- Adding P1010044.JPG
Warning: Unable to open 'none' for reading: No such file or directory in /var/www/html/petri/modules/gallery/platform/fs_unix.php on line 24

Warning: Unable to open /home/gallery/gallery/album01/aaf.jpg in /var/www/html/petri/modules/gallery/util.php on line 473
============
If I go directly to mysite/modules/gallery and login, I can upload without a problem.

Any help would be greatly appreciated.
Thanks!

PHP ver: PHP v4.0.4pl1 is OK
Gallery ver: 1.3.3
Postnuke ver: 0.723
OS: Linux
Browser: both IE and Netscape have the problem.