"Problemkind" or "Problem child" - also known as a "question mark" - is a phrase that comes from the well-known BCG Matrix.

Read these for information:

http://de.wikipedia.org/wiki/BCG-Matrix
http://www.netmba.com/strategy/matrix/bcg/

"A question mark (also known as a "problem child") has the potential to gain market share and become a star, and eventually a cash cow when the market growth slows."