Apps google map color changes to blue

[usml]

I have an app that uses MapView and works fine on emulator. On phone (Samsung Captivate), the yellow-ish map change to blue from time to time, when zooming or sliding the map. has anyone seen the problem before? TIA.

 

[vladimirov]

Maybe do you draw some overlays on map that takes a visibility on zooming or sliding?

 

[usml]

Hi -- thanks for the reply. Yes I do have a few simple images (each have size of 12x12) on an overlay. How can that become affecting the map color?
When the color changes to blue, roads become solid blue, other area is light blue. It feels like something get changed in mapview parameters...