How do you change your display pcture in MSN Messenger for Mac?

The option to change your display picture is there but when you select a preset picture and click OK it doesn't do anything. When you want to use a custom photo an error message comes up that says it's 'Not a valid picture format', even thought it's a JPEG or a BTMP..please help.
How do you change your display pcture in MSN Messenger for Mac?
jpeg should work unless you have a corrupt file

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