added problem i noticed in AeroDyn
added problem i noticed in AeroDyn

git-svn-id: https://windsvn2.nrel.gov/FAST/branches/BJonkman@495 10acb478-4768-415a-8850-bacdb5912d4d

Former-commit-id: 82debccb874157eefab97a83a80e04ec688939f2
OpenFAST/OpenFAST,OpenFAST/OpenFAST,OpenFAST/OpenFAST