I had Minishowcase working one server and moved the whole operation to a second site. The gallery on load goes to 'null'. I can run the slideshow and see the photos but no thumbnails.
[OS, browser, server and the version of your gallery and, if possible, a link to it. It eases the helping process.]
OS: Windows 7 Home Premium (64-bit)
IE: 8.0.7600.16385 (64-bit edition)
thecasadelosrobles.com: Linux host203.hostmonster.com 2.6.32-20130307.60.9.bh6.x86_64 #1
GD Support enabled / GD Version bundled (2.0.34 compatible)
second server with problem:
kirkviera.herobo.com: Linux / Apache 2.0 Handler/ srv45.000webhost.com 2.6.18-238.9.1.el5 #1
GD Support enabled / GD Version 2.0 or higher
Minishowcase version: v09b142
link to working version: http://www.thecasadelosrobles.com/kirk_viera/minishowcase_v09b142/index.php
link to non-working version: http://kirkviera.herobo.com/minishowcase/index.php
The galleries directory is set to '777' permissions. The folder, "portfolio" resides in the galleries directory.