Windplayer there is a fix availble for the tree problem that clears an area around all FSX airports so that the annoying tree problem is removed, I don't have it after a hard drive malware problem led me to loose a lot of stuff that I had not backed up properly and the backup not restoring properly. I think it was called lumberjack or something like that. I am presently looking for it searching on 'tree-fix'. Trouble is it takes away all the trees and gives you a big brown rectangle or similar around those small airports. Another fix would be to change all the tree files, which is actually easier, but yeah that big pine on final can be a pain.

My biggest bug is the GPS. In real life you can get GPS to do all sorts of amazing stuff. My biggest bug is not being able to load a new plan or create a new plan midflight and or being able to modify an inflight plan to say miss a couple of waypoints and direct to the second last one and for the GPS to keep tracking on the original plan. Not being able to use it to overlay approaches is also a pain without a great deal of fiddling and the way once you pass a DCT TO point it stops displaying a track on screen. And so I could go on. I have better versions from friendly panels but don't think you can port them across or alias them to other models (well not that I can do it).

Second thing, the map display that can't be looked at without stopping the whole show while it brings up the map, why it could not display in a small discreet window like ATC dialogue and GPS does I don't know. IF it did you would be able to get all that good stuff about Radio frequencies, airports etc that real GPS units have in their databases.

Third - the crappy rain textures. You used to get nice beads in 2004 but now just long streaks with noise. I know there was a polygon modelling issue for the drops in DX9 DX10 and FSX but geez it looks like crap.

Fourth  and final the crappy ATC, cant get course diversions to go around thunderstorms, can't get holding patterns, don't get holding patterns, never lets you fly an NDB properly and gives you the hurry up all the time climbing or descending.  >:(