-e: facebook assembly not found after script recompilation

works fine in 4.2.1

-repro:
--open attached project (just the FB sdk from A$)
--play the example scene from facebook and do the FB.Init
--stop scene
--open the InteractiveConsole.cs with MD
--change the type of the variable 'random' at the top
--save
--switch back to unity
--wait a few secons
--NOTICE exception being thrown:
FileNotFoundException: Could not load file or assembly 'IFacebook, Version=0.0.0.0, Culture=neutral, PublicKeyToken=d9f0385cc69e16d8' or one of its dependencies.

--reopening Unity lets you continue