Hi Grzegorz,
Why do lightmaps turn off on certain camera angles, specially when going to a top or semi-top point of view? Please check this video:
<!-- m --><a class="postlink" href="http://files.wildspad.com/afecelis/esenthel/files/lm_off.zip">http://files.wildspad.com/afecelis/esen ... lm_off.zip</a><!-- m -->

regards,
Alvaro

Hi,

do you have enabled directional or ambient lights in the Mesh Editor?

Menu\View\Ambient Light
Menu\View\Directional Light

for viewing lightmaps you should disable both of them