I have a problem with MGE and Redesigned Vivec.. After I installed RV and some other mods I recreated the distant land as i normally do...

But now the distant land of Vivec is a mix of both the normal version and the new one... until I get close when it goes to RV....

HOw do I fix this?

Are you including statics when generating distant land? When you generate distant land, make sure you have RV checked in the list and also make certain you have statics included. As far as I understand, the only thing distant land doesn't and currently can't acknowledge is changes in landscape. The cantons aren't landscape. If you aren't seeing doors, or are seeing doors where they don't belong, you'll need to generate activators, too.

Yes I used statics and yes RV was included in the list but still both version appear in game.

If I were you, I'd post my problem to http://www.gamesas.com/index.php?/topic/1097626-morrowind-graphics-extender-mge/. If you've already got the mod and distant statics active, then the developers should know of the issue and they can probably help you solve it.