I use vector graphics to run a CNC and engraving machine. One of the tricks for text is to use stick fonts, single line fonts, whatever you want to call them. The ones I use are actually regular true-type closed-outline fonts, but they have been designed so that the outline overlaps and presents a single line.
Anyway, I have an issue where when I create text and then change it to one of these "single-line" fonts, the text disappears. I don't mean it's background-colored, I mean that the text box vanishes and is no longer editable or selectable, and for all intents and purposes has been deleted. You don't even have to actually select the font, just hovering the mouse over it in the font menu will make the text box disappear (I'm assuming that's because of a live preview). Hitting undo to go back to the old font does not bring the text box back, and in fact if you scroll over one of those fonts in the list without clicking and the text disappears, scrolling to another font doesn't bring it back. You have to create a new set of text, and change the font back to one that does not exhibit the behavior, such as Arial, before typing any text.
Here is a link to one set of the fonts I use that exhibits this behavior for those wishing to test the behavior. I have several, from different sources, that all do the same thing, this is just one of them:
http://www.mrrace.com/CamBam_Fonts/index.htm
I don't know if this is intended behavior, a bug, a yet-to-be-implemented feature, or I'm just dense and don't understand what's going on. Does anyone have any thoughts?