db.find({}) on acollection greater that 101 documents hangs forever

the same query with .limit(101) or lower succeeds but any limit above that the query hangs forever.

there is no noticeable speed decrease up to 101 just a dead stop!

After this no other db query completes (no matter how small)

the full problem (where multiple people have publicly tried to assist is here: http://stackoverflow.com/questions/38470345/mongodb-db-collection-find-does-nothing-past-limit101)