Check your skin, though I recall some one else also pointing this out.
Manage skins;
Texture format;
should be 8 to 24 bit but 24 bit for todays graphics, not 32 bit.
Sorry if you been thru this but there is no reason why you have no dynamic shadows unless
1. Sunlight turned off.
2. Dynamic lights not enough range for minimun shadow creation.
3. Shaders which affect other lights in level
4. Alpha skin settings on.

I have no probs as Quadraxus states, I simply apply the conditions and the shadow is their dragging down on my frames per second render process