Before post AD problem - Ad-Sharing 1.1.9, WPMS 3.1, BP 1.2.8, MultiDB 3.05

Hi,
I've just upgrade Ad-Sharing 1.1.9 (from ver. 1.1.2) and I have strange problem. Ad before posts sometimes appear, sometimes not. Ad after the post appears always.

I've limit Ad, max 2 per page.

What can bi problem?

P.S. You can check some users blogs at http://blogge.rs (just refresh couple of times post page).

Tnx.
Srecko