I get an annoying bug with my default A321 plane. It looks like the fuel flows out of the fuselage and there is ground under the plane, but no.I hope the pic explains it better.<OVERSIZED IMAGE REMOVED BY MOD>As you can see the contrail is about 5 meters under the plane, look really freaky.

Not sure about your contrail problem. How do they look from a front to back external view?? Mine work ok. As for ground under the plane?? it should always be that way . :(

I get that too.The streaming effect below the a/c occurs when taknig off from a dirt/rain soaked/snowy runway with default a/c. It appears to be an FSX bug??The streaming effect (not shown by you) I think you are referring to as fuel flowing from the wings is an air vortex on the wing edges visible at certain times on some a/c occasionally.

Any way to fix it?