I recently upgraded to Dynamo 0.7.5 and downloaded the latest release of LunchBox. When trying to run an old definition, I kept getting null values. After closely examining each node in the definition and attempting to rebuild, I noticed that the only output from the Room Element Collector was “_SingleFunctionObject”…
A thorough internet search revealed that I had overlooked the “Toggle” feature on the Room Element Collector node as described in this recent post by Nathan Miller:
http://www.theprovingground.org/2015/03/rhynamo-and-lunchbox-updates.html
By simply connecting a Boolean node to Toggle, I was able to bring my definition back to life. This is a very novice problem but it seems worth the post in case any other new Dynamo users are looking for answers.