Should I go back to Unity 2.1?

I moved my project from Unity 2.1 to 2.5 windows version (both pro version). I can make both windows and mac build with version 2.1, then I did some terrain editing and tried to make a build with widows 2.5 version, Unity just crashed, neither windows nor mac build can be created even once successfully, but when I moved back to 2.1 version with modified terrain, I can make both builds.

Any suggestion?

Please report the crash using Help/Report a problem or by running the bug reporter application if you haven’t already done that.

I’ve reported this problem with bug reporter.

Same project, NEVER succeed (crashed all the time) to make a build under windows vista but NO problem on the old Mac.

I have to do every change under Windows Vista (2.5 pro version) and build my project in 2.1 pro version.

Any clue?