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Q: I observe the lack of all text labels on the charts (primitive "Diagram") of the UI.WebVision module interfaces. Why so?
Re: This result is possible on interfaces constructed on the GD library, and if this library is compiled without using the FontConfig library. Currently only UI.WebVision module uses this library for the exclusive construction of the "Elementary Figure" and "Diagram" primitives.

+> Therefore, to fix this problem, you must install the correct library package or build the library yourself with FontConfig. Currently, there is one such instance of the problem with the "libgd2-noxpm" package of the older versions of the Linux Debian distribution where you must install the correct "libgd2-xpm" package.