[RussWhite]

Found some pics.  I bet many of us have had the experience with those latches where the fixed portion will snap into the locked position without the moveable portion being held in place.   Once that happens, you must pry open the latch to the other position so it will catch the door/drawer next time you close it.  The stupid looking "tool" in one pic was what worked for me to reach up and open the latch when the shade closed it without getting locked.  Sure beat pulling out the wall again.   I suspect there is enough play in the wooden tracks that it allows this to occasionally happen.  Once I replaced the broken latch, over time I have developed a method of going slow and haven't had a problem for a long time.