FSX Acc SP2 texture problems

helloi used to paint a lot of aircraft in FS9. i have switched to FSX Acceleration Pack Sp2 recently and i tried to repaint a FSX model. I modified nothing else than the color of the texture and now the aircraft in FSX looks like it would have too much alpha. More, it looks like blank metal glossy.Any ideas on what this could be? Any tips on painting with PS FSX SP2 textures.The second problem i have is with trees from FS9 scenery. They have a black surrounding. I compared them with default FSX Sp2 textures they look identical from alpha channel and layout.Where is the problem?Thanks for helpMartin