When a block is inserted the right hand windows disappears, no layer or block window.
The view->toolbar controls will not make the layer or block windows show.
If the block window has been detached it stays visible. The main edit window seems to grow beyond the screen size.
It seems that the main edit window is overlaying the right hand window real estate after a block has been inserted.
Only a exit and restart of the whole app will make the block and layer windows show up again.
A work around is to undock the layer and block windows before add a block.
SCM Revision: 2.0.0alpha4
Compiled on: Oct 17 2012