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I had a project with some forms and I had opened them in the editor before checking them out and as such they appeared as read-only ("[r/o]") in the editor view and I couldn't change anything. I then checked them out from version control (VSS) and they no longer appeared with the read-only mark, i.e. "[r/o]". Nevertheless I continued not to be able to change anything. i had to close the form and reopen it to be able to edit the form.
*** This issue has been marked as a duplicate of 33487 ***