Could be: going from shaded environment to full sun without adjustment period, too much or too little water, or too much fertilizer. More info about what all you've done would be helpful.

Gary

Gary,
Yes, it was first about 1 yard from window. Now I put closer, as you can see at the picture, very close to window, but it still have a curtain on it.
To much water& I don't think so. Watered as it got dry, maybe once-twice a week. Didn't put any fertilizer yet, because it was planted in organic fertilized soil (All purpose type - maybe this wrong?). Will try to repot today and see whats wrong - maybe root problem?
Thanks for all advices.

I bet you might find out something when you repot, like if the lower soil is saturated or not. Some pots retain too much water low, but dry out high. Let us know.

Gary

It could also be a nutrient deficiency. Check to see if it looks like any of these:

http://www.advancednutrients.com/articles.php?articleID=41