I have a error in 3.6.8
 

When i upload a photo a have this error:

Sorry, draque1: Bad Type - File is of the Wrong MIME Type

Why, until a week ago it's works

I think the problem is it mai nickname. From other users it's work to upload ..

I had this issue as well. For me, it's because the permissions on /photos/images somehow got reset. If you chmod -R 777 * in that directory, it may resolve your issue.

I can't see your nick having anything to do with it. Could be a file type that isn't supported, but most likely as volarium said. I found the default permissions for photoplog/images were set at 755. Really do need that folder (and files within it) to be CHMODed to 777

Double check that the PhotoPlog images directory, and all subdirectories within the PhotoPlog images directory, have 777 permissions. On a *nix server, to set 777 permissions in one go via hell, cd to your PhotoPlog images directory, and then type the following:
Image files themselves do not need 777 permissions. They can be 644 permissions.