ok, this is around one year later from James' original post, and i am facing this exact same problem!!
i need to build a long road, but if it reaches more than 30,000 quants further than the origin, i get horrible distortions in the blocks (road, sidewalks..) !
what do i do?? aparently the problem has not been fixed by the new WED as Doug menitoned, because i'm using the WED version 5.3 , which comes with the gamestudio version 5.240..
please help!!

The mentioned fix allowed for using a larger range than +/- 50.000 quants, but it does not directly affect the precision of objects that far away. Some of the changes I have made to the map compiler should improve precision though. The way it works is that a certain number of bits is used for the integer part of position and a certain amount is used for the real part of the number (before and after the ".")- if you are close to the origin almost all bits can be used for the real part. If you approach a region that's far from the origin most bits are used for the integer part and blocks become less precise.
Possible workarounds are to use terrains, MDLs with invisible collision geometry, or just draw the road on a texture on a less curved block.

My game is getting prety high i dont know quants but its 16 240 portals or something. i have allot of stuff the graphics are very good the detail is very very good. it takesso long to build.

ummmm,
i'm a newbie so don't flame me if i'm wrong, but if its only the last block that ever distorts, couldn't you just put an extra block on the oend of your road and make it invisible and passable and stuff? It would be distorted but it wouldn't matter......
~V~

Marco,
thanks for your suggestions.. but our street blocks are all straight, not curved

tho i must admit i didn't think of putting MDLs instead of the misbehaving blocks... the only problem is i need all the entity quota i can get for trees, cars, buildings, and ppl in the street.. so i wouldn't want to waste any on blocks that make up the street!

anyway, is there any plan to fix this issue in future upgrades/versions?
thanks..