KB00098 - Stickies has letters where icons should be

It looks a little like this:

Thie icons are provided by a font, which is embedded inside the Stickies app. This means the font file should always be available as you already have it.

However, a few computers, for some reason I don't understand, fail to load this file. For those, installing the font onto your system has solved the problem.

Download the below, and install it, and the problem should be solved.