I didn't put an explanation on purpose. If you read my previous bug reports you will understand my irritation. Either you are happy with the exception traces as they are, or I'll stop sending them. If I want send a full bug report, it will not be through this EiffelStudio interface which does not allow me to try to reproduce the cause of the problem, or even might crash before actually sending the report to ISE as it already happened to me many time. Glad to hear that this particular bug is fixed though. I noticed that EiffelStudio 6.3 is not very stable: lots of crashes after compiling. It happens twice to me yesterday, but I was not even able to send the exception trace from EiffelStudio. It crashed when I clicked on Send, which is definitely a waste of time when one spends time to precisely explain the cause of the problem.