Dublicate Notes via IMAP w/ Mountain Lion and iOS

Hi,

after upgrading to Mountain Lion Notes are broken on iOS. Originally I read/wrote Notes (while part of Mail) via our corporate IMAP server for 2 years (Mac, iPhone, iPad) w/o any issues.

Problem: every Note created on the Mac results in multiple dublicates on iPhone and iOS (same under iOS 5.x and 6). It seems all incremental state changes create new dublicates on iOS - while on MacOS it is correctly just on note. It works correct the other way around: creating/editin notes on iOS does not result in dublicates on MacOS Notes.

I tried various tips from the Apple Support Community (deleting com.Apple.Notes etc) but nothing worked. This is nearly making my setup unusable for weeks now - any ideas?