visibility of error messages
The important error messages should be more visible, for example using a red background in the message windows (but no popup, please!)
Also, in case of syntax or typing error, the error location is in orange background, it could be made stronger for example with red background and an orange background for the complete line
Finally, there is a bug when a syntax or typing error occurs at startup: the location of the error is highlighted in orange for a fraction of a second, then disappears.