The filenames are changed into a md5 hash of the file for security
Tiki does not use the imagemagick binary, instead its the php4 module.
GD2 works fine, providing :
- its set to GD in the admin panels
- You arent running out of PHP Memory
I use GD on many systems ranging from RH9 with Apache 1.3 upto Apache 2 with PHP 4.3.8 and GD2 on various servers.
and personally it runs much better with storage set the file system anyway.