GUI bitmap values good pointer goes bad

I'm trying to add some bitmaps to the GuiReticleHud Gui control but when I try to add the bitmap to the texture object I get a bad pointer. I've copied the code from GuiRadarCtrl and checked it against GuiBitmapCtrl and they seem the same.

When the function starts the mRecticleBitmapName is populated with the string to the bitmap as expected, but the moment it sets the mRecticleTextureObject it becomes a bad pointer - but the radar one doesn't. What do I need to do to make it "stick". See pic below for watch window and code. The strange thing is, I can see the bitmap in the game, but it crashes when I try to go to the GUI editor (F10)