From a QCAD user:
I drew some lines, rectangles etc. I wanted to fill the rectangles with some hash. However I had the problem of selecting the select tools (arrow in the actual tool box). So I shut down everything and restarted the program. This time it didn't come up with the tool menu on the left as it used to the default in the old version. However, the select tool was on. I chose the rectangle to fill, filled it with some pattern, went back to drawing a rectangle and found myself back at square 1, i.e couldn't get the select arrow.