Rook

I downloaded Houdini Apprentice a few days ago. In the course of learning the program, periodically a dialog box, called Houdini console, comes up. The dialog box has multiple lines of the following (paraphrased): NT_Generator Thread:: queue . .. . Event Dropped. At that point, everything locks up. When I try to close the Dialog Box, other copies of the Dialog Box appear. Has anyone experienced or diagnosed this problem?