I would like to ask you for more details.
a) Please let us know the model type, model origin (reversed? new? imported from TDM2?), database + object types that it contains (entities, domains, procedures etc.)
The best would be if you could send us your model. If you can, please send it to: email@example.com. Thanks.
b) Please have a look at the Message Explorer if there is any message preceding the error message (e.g. script error on line xxx etc.)
c) During the model save, is any form/dialog relating to the model open? (E.g. Entities dialog or Comparator etc…?)
Thanks very much for the details.
Vladka + TDM Team