Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Only occurs in one specific spot in the world - near Palm Springs CA. Might be some kind of mesh issue?
I heard UTX does some strange things sometimes?
I heard the world is going to end next year, should I be worried?
Only one Ultimate Terrain product comes with mesh and that's Alaska, which is a long ways from Palm Springs. To spread around possibly inaccurate information based upon what you've "heard" isn't cool. What you know, great, pass the info along. But for unsubstantiated information, please, put it in the Recycle Bin where it belongs.
For the record, I've worked with the developer of Ultimate Terrain on all the products for FSX and other than a bad water elevation setting for the Salton Sea, which is in the vicinity of Palm Springs, I have never seen this type of problem from adding UTX or UTA to a FSX installation.
You might find the offender by disabling things one at a time till the problem disappears
. In my case the Mesh problem was solved by changing the order in the scenery library, I lowered that problem child mesh to the bottom of the list and everything has been fine since.