I've added Tooltips to a toolbar in C++ V1.52 using the CToolbarx class from MSDN. It works great on most of the Windows 3.1 systems I've tried. On one system, though, the little yellow box for the tooltip opens up but it is empty. I'm guessing that a required font is missing but how can I tell? If this is the case, I need a way to tell at the time of installation so that a proper font may be installed.