Broken: 40822ae, 2017-12-04 (daily build)
Short description of error
Not sure when this broke because the last daily build I used was from a month ago. Entering edit mode and invoking Loop Cut and Slide shows the text at the bottom but no purple lines appear. This wasn't really the bug I wanted to report but I can't report that bug until loop cut is working again.
Exact steps for others to reproduce the error
Get the right build (40822ae), create a new blend file, add a cube, go into edit mode, invoke Loop Cut and Slide. No purple lines appear.