I have been an Archicad user since 1995, but I have been inactive for the past six years. I recently opened up the program to work on some ideas I had for a house. Once I kicked off the rust I was able to create a plan but when I went to use the stair tool, I ran into a problem. At first, I was able to create a stair and place it on the drawing. However, when I select the stair again and try to modify it using the Stair tool, the info box just kind of blinks on screen and disappears. After that, I can't select any of the tools, not even the arrow. I have to restart the program just to keep working. But the same problem happens when I select the stair tool again.