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[nb_dev](200406201800), [jdk1.5.0](b51) I am not sure it's form issue (maybe window system is responsible) ... feel freee to reassigne Steps to reproduce; - run IDE - open form file - incoke popup menu on Form editor tab and push "Clone Document" -> bunch of IllegalStateExceptions rised (see attachment) from now you can't use this editor , close and tried again ...
Created attachment 15881 [details] IllegalStateException
Fixed.
verified in [nb_dev](200406281800)