I have a similar issue to this.. and I think it has something to do with virtual hosts etc..
Part of the proble is, 4images is a PHP script.. and on some hosts, to call something like ImageMagick, you have to be able to access executables somewhere.. well, unless PHP runs in a cgi-bin, this may not work properly becuase PHP inherently uses "nobody" as it's author.. and virtual hosts don't let "nobody" write to peoples web spaces..
In other words, it becomes a permissions issue..
If anyone knows about this, or a way around it, please let us know..
Syke