Hi, This behaviour is usually due to an infinite recursion. In this particular case, the recursion is given by at least the following circular references in the MSE file: (FAMIX.Folder (id: 2117) (stub false) (name 'lib') (belongsTo (idref: 2124))) (FAMIX.Folder (id: 2124) (stub false) (name 'lisa') (belongsTo (idref: 2117))) If you ask how I found this case, it was manual: I immediately pressed Ctrl+Y (to spawn the debugger), I started from the name of the Folder that created the recursion, and then I looked it up in the MSE file and then walked to its belongsTo and that was it :). Cheers, Doru On May 23, 2007, at 12:41 AM, Adrian DOZSA wrote: -- Tudor Girba www.iam.unibe.ch/~girba www.iam.unibe.ch/~girba/blog/ "The coherence of a trip is given by the clearness of the goal."