IMCE 7.19 is installed as indicated on README, for drupal 7.28.
mysite.com/imce shows the window for uploading;
it's then possible to choose the image on the computer with any size, and upload;
the first message is that the file is uploaded, the second one that the file is not an image;
the file's name is in the server file's list, but without any image on the server;
when i try to delete it, the message is that this choice is forbidden, contact the administrator (i translate from french).
and after trying n times with the same file, i get file_n.jpg in the list.
after refreshing the directory, all these "files" disappear, but the next try will give file_n+1.
note : when the image is already on the server, I can insert it with IMCE in my text (I'm using ckeditor)
auto-edit : of course I the administrator / user 1