Apple has released version 10.13 of macOS on 25th of September 2017. Unfortunately WireframeSketcher has an issue when running under this version of macOS, making it almost unusable. This issue manifests itself as missing text in some components, more specifically in components that use embedded icons wiki syntax.
Here’s a screenshot that shows what the problem looks like for Tree widget:
We’ve tracked down this issue to a low level problem in Eclipse platform that needs to be investigated and fixed. The progress on this issue is tracked as Bug 525465.
Our recommendation is, if possible, to stick with macOS 10.12 Sierra until we find a solution for this issue.