Great app...been using iCan since the beginning starting last Dec. and I highly recommend it. For now, with this stop-gap beta version 3x, the black background square visible on earlier 2x versions running with Panther is now gone. This is great. But the right mouse button does not work.
Also when you enable Exposé, the iCan icon is removed like other windows, then it will reappear. That is what I have found so far. I am glad the Developer is working through this and based on his past work am assured that he will overcome any issues and create a sound update to a really wonderful and indispensible app.