I created a complete projectplan including Gantt. I addressed resources and everything looked OK. Somehow I lost al data from the resouces tab. Values dissapeared, and also the title bar on top was gome. I tried to retype stuf, but this did not work. Double clicking on some fields made some tekst reappear, but I was not able to retype or modify any info.
I tried to create a new Pool, but that did not help either.
I created a complete new project and everything seemed to work fine. However once some of the values vanished again. this time I managed to add new values.