Is it possible to change the colour of the "Message bar" (have not found an explanation in the Help how it is officially called, but please see attachement)? The colour settings of the application does not show any specific setting for this.
The Notification Area uses different colors to indicate various things. From information (blue) to warnings (orange) to errors (red).
Users cannot change the colors of the Notification Area.
When IMatch displays something there, you should consider doing it. Like, in this case, run a database diagnosis.
Then you won't see the notification again, unless you skip database diagnosis for too long again.