Observations - Sidescroller Tutorial

Started the Side Scroller Tutorial ...

Some observations (bugs?) 

1 - After placing the Jump Thru blocks on a Tree ... and testing them ... I hit the W key to reshow the dialog ... it hung.  Had to exit, restart level (didn't have to totally exit which does say something I guess).   

2 - The HIDDEN block area is already placed ... you can see that when editing ... so I didn't have to do anything other than play thru.

3 -  When I tried to exit Game Machine ...  hung with Windows (10 Pro - 1903)  wait cursor and never exited ... clicked on window and Windows Dialog came up to force shutdown or wait.   Tried Waiting ... eventually had to force shutdown. 

4 - If remove or change a block ... is there an undo option?   Tried Ctrl-Z ... nothing.   Would be nice to Undo at least some changes if I wanted.