no thumbnails generated

I am not getting any thumbnails. I just have "no thumbnail" everywhere.
The large images are getting uploaded, whether I do it via the web or through FTP.

In the "Site Admin" I was looking at modules and from reading some threads on the forum, I thought it was a problem with GD, so I disabled it. But I cannot reenable it. Same with ImageMagick, which I also disabled accidentally. I get the following errors trying to reenable them:

for Gd

Error (ERROR_STORAGE_FAILURE)
in modules/core/classes/GalleryStorage/DatabaseStorage.class at line 782 (gallerystatus::error)
in modules/core/classes/GalleryStorage.class at line 261 (mysqldatabasestorage::addmapentry)
in modules/core/classes/interfaces/GalleryPluginParameterMap.inc at line 124 (gallerystorage::addmapentry)
in modules/core/classes/helpers/GalleryPluginHelper_medium.class at line 385 (gallerypluginparametermap::addmapentry)
in modules/core/classes/helpers/GalleryPluginHelper_medium.class at line 335 (gallerypluginhelper_medium::_addparameter)
in modules/core/classes/GalleryCoreApi.class at line 306 (gallerypluginhelper_medium::setparameter)
in modules/core/classes/GalleryPlugin.class at line 210 (gallerycoreapi::setpluginparameter)
in modules/gd/module.inc at line 70 (gdmodule::setparameter)
in modules/core/classes/GalleryModule.class at line 168 (gdmodule::upgrade)
in modules/core/AdminModules.inc at line 68 (gdmodule::installorupgrade)
in main.php at line 170 (adminmodulescontroller::handlerequest)
in main.php at line 47
in main.php at line 40

for ImageMagick

Error (ERROR_STORAGE_FAILURE)
in modules/core/classes/GalleryStorage/DatabaseStorage.class at line 782 (gallerystatus::error)
in modules/core/classes/GalleryStorage.class at line 261 (mysqldatabasestorage::addmapentry)
in modules/core/classes/interfaces/GalleryPluginParameterMap.inc at line 124 (gallerystorage::addmapentry)
in modules/core/classes/helpers/GalleryPluginHelper_medium.class at line 385 (gallerypluginparametermap::addmapentry)
in modules/core/classes/helpers/GalleryPluginHelper_medium.class at line 335 (gallerypluginhelper_medium::_addparameter)
in modules/core/classes/GalleryCoreApi.class at line 306 (gallerypluginhelper_medium::setparameter)
in modules/core/classes/GalleryPlugin.class at line 210 (gallerycoreapi::setpluginparameter)
in modules/imagemagick/module.inc at line 75 (imagemagickmodule::setparameter)
in modules/core/classes/GalleryModule.class at line 168 (imagemagickmodule::upgrade)
in modules/core/AdminModules.inc at line 68 (imagemagickmodule::installorupgrade)
in main.php at line 170 (adminmodulescontroller::handlerequest)
in main.php at line 47
in main.php at line 40

Any ideas why I am getting such errors? Thanks.

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Gallery URL (www.clio360.com/photos):
Gallery version: g2 alpha, nice comments
Webserver (with version): Linux 2.6.7-1-grsec
Datatabase (with version): MySQL 4.0.22-standard
PHP version (eg 4.2.1): 4.3.10
phpinfo URL (optional): http://www.clio360.com/info.php
Graphics Toolkit(s): in siteadmin, gd, imagemagick, and netpbm installed
Operating system: Mac OS X 10.3.7
Web browser/version: Safari 1.2.4 (v125.12)