A strange Error Message, and a wrong message persistence

[ceraolo]

I had the following behaviour with OM 1.9.4-dev-667 (as reported by OMEdit)

0) launch OMEdit (with Modelica trunk as library)
1) duplicate Modelica.Electrical.Analog.Examples.Rectifier (let this new model be Rectifier1)
2) open Rectifier1
3) check the model. It correctly compains about "SI " being undefined.
4) add as a row N.2 the following one:

import SI=Modelica.SIunits;

5) check again. The

Problems are fount in Modelica Text
Please check the Messages Browser for more error specific details

is displayed.
Unfortunately nothing is shown in Message Brower.

6) remove the added row
7) check again. The message shown at step 5 is still be displayed, even though the cause of that message has been removed!