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I've discovered a bug. It appears to be a bug in LabVIEW. Here is what I believe is happening: Hiding inside each instance of a Y Control is an instance of "C: ... \LabVIEW xxxx\resource\plugins\Y Control\Ability Manager\Y Control Ability Manager.XCTL". When LabVIEW loads an instance of a Y Control that depends* upon another Y Control, there are 2 instances of "Y Control Ability Manager.XCTL" that need to be initialized: One for the outer Y Control and one for the inner Y Control. The "Init" ability of the Xctl for the inner Y Control gets called first, and it works OK. However when the "Init" ability is called for the outer Y Control, it is passed the wrong refnum: Instead of getting the refnum to the instance of the Xctl in the outer Y Control, it gets a refnum to the instance of the Xctl in the inner Y Control. *In my case this happens because I have a Y Control calls a dialog VI that contains a reference to a VI that has a Y Control.

This very much depends on the used font. Not all fonts specify glyphs for all these attributes. If it doesn't, the attribute request is simply ignored and the font is drawn in the basic form. LabVIEW doesn't draw these texts, it just passes the request to Windows GDI (or Unix XWindows, or MacOS Quartz) and tells it to do its work).