I've spent a lot of time to find why my local installation of cmsms 1.0.2 doesn't create thumbnails in ImageManager. Searching on forum I've found many solutions but nothing works so I decide to add my situation, maybe can help someone.
Finally I understand the problem: for some reason that I can't figure out (probably my mistake/configuration) all files in lib/filemanager/ImageManager/Classes are lowercase so Image_Transform class can't find inclusion file.
I've solved changing $config['image_manipulation_prog'] = 'GD'; to $config['image_manipulation_prog'] = 'gd'; in config.php.
Surely there are other better solutions but this one works for me.
[solved] ImageManager thumbnails creation case problem
Re: [solved] ImageManager thumbnails creation case problem
I had also to change file GD.php to gd.php
You can find it in lib/filemanager/ImageManager/Classes/
You can find it in lib/filemanager/ImageManager/Classes/

