Problem saving flight with non-standard livery

Hallo,

I have a strange problem: if fly with 737 800/900 winglets, that comes with the product, then I can save my flight and load it latur to continue, and it is functioning correctly. But with the downloade livery Air Berlin winglets the program do save the flight, but it is not visible on the list in diolog for opening saved flights. What's going wrong? Is saving possible only for original liveries?

with best regards

Rafal Ziolkowski