Hey i had some problems too but all i did to fix them was to turn off my iphone and then turn it back on. If that doesnt do it make sure you put what ever the picture is in the right place such as... If you are tryin to change the notes thing then you would wanna say
"putfile /Applications/MobileNotes.app/icon.png" where as the wrong way
"putfile icon.png" because this will throw it in the main directory / even if you are where you want it to be.
Prolly not ur problem but if it is glad to help.
