The top of the error window has the following text. Exception, if you want to see more information look into details Reason: <error text here> I am running a windows 7 PC with 32GB of ram. This issue prevents me from saving a jrxml. When I close and reopen it, I lose all changes that were made since the last successful save. I can save it up to a point then when this exception occurs I must restart Studio to be able to work again.