I am not able to create thumbnails when uploading images to WP. Here is my configuration:
Fedora Core 4
Apache 2.0.54 (rpm)
PHP 5.0.4 (rpm) with php-devel, php-gd, php-mysql, php-pear, php-ldap, and php-mbstring
GD 2.0.33 (rpm) with gd-devel
When I first installed WP, I would get the error "Filetype not supported. Thumbnail not created." whenever I tried to create a thumbnail. After reading the message boards, I realized I needed gd support for php. I then installed the php-gd rpm. I checked my phpinfo and now I have gd support enabled.
Now when I try to create a thumbnail, instead of getting the "Filetype not supported" error, I get no output at all. The page is still there with the css and the options across the top, but the text box that usually tells you your image was uploaded is completely empty. I tried uninstalling php-gd, and the "Filetype not supported" error came back. I reinstalled php-gd, and the box was empty again.