Not "Click to select an image, Ctrl-A selects all images in folder" but
"Click to select an image, Ctrl-A selects all images in folder(windows only)" correctly.
I'm trouble trying to find if you have any specific unanswered question here ...
"The user cannot be deleted" - Is this because you are trying to delete the main "admin" user? Other reason may be if permissions have changed, or if your server has safe_mode enabled.
# Mac-Safali demands yoursite/imagevue/language/en.xml
Not sure where you get that message from. There are no files called that, and imagevue certainly isn't trying to load it(unless you have set a language file called 'en')
# The rotate function is buggy because of the GD extension. For now we recommend rotating before upload.