muppix on "Update issue with parent theme"

Hey Gang,

I've made my own child theme based on Gridiculous Pro. Nothing extreme, just a few PHP tweaks here and there and some styling changes. However, when I activate my theme I now see an invitation to update the parent theme to the same version that it already is.

https://dl.dropboxusercontent.com/u/13316684/gp_theme.png

Running the update does nothing except temporarily remove the update notification, which is back again on the next screen. The weird thing is, reverting to the parent theme in place of my child theme doesn't get me an update notification, so I think it's something in the way that WordPress is handling the child. Any ideas?

Thanks in advance!
Mark.