Hi, I currently use Visual Studio 2005 ITK 3.10 VTK 5.2.1 FLTK 1.1.7 and want to upgrade to the most recent releases ITK 3.18 VTK 5.6.0 still with VS 2005 what experience did you have with fltk? is it worthy/recommendable installing fltk 1.1.10? or I would better stay with 1.1.17 which worked nice for me in the last few years? Much thanks, Zein