Troubleshooting
No signs appear after pressing the button
Check three things: that you have actually placed a sign, that any hand-built boxes are wired into input 2 and not input 1 (input 1 is the building geometry and passes through untouched), and that each hand-built box carries a front-face group.
Signs show colour but no glow
The colour in the viewport is a preview. The glow is only visible in a Karma render - press Send to Solaris and render.
Rendered signs are dark
Check Keep Colour (Cd) and Keep Emission (emit) are both on. Check the material library has not been deleted. Press Send to Solaris again to rebuild it.
Tubes or signs are the wrong size
Set Real-World Scale to match your scene's units: 1 for metres, 100 for centimetres, 3.28 for feet.
Standoffs are missing
A standoff only builds where it finds a building surface within reach. Standoff Count sets how many a sign tries to build; only the ones that actually find a surface get built.
A note did nothing
Press Give me the Signs, or Apply on a card, to apply a note - typing it alone does nothing until you do. Read the status bar for what was understood and what was not. A card's Note or a Manual Override can beat a street-wide note; the status bar says which one did. A scope phrase like "big signs" needs an instruction paired with it - "red on the big signs" works, "big signs" alone does not.
A force attribute in the pre-plan VEXpression stripped every other sign
You wrote a numeric type instead of a string. Every force attribute is a string, including the numeric-looking ones. See VEXpression.
A force did nothing
Check the spelling against the Advanced row's own values. An unparseable value is ignored rather than guessed at.
The scene is slow while placing signs
Turn on Placeholder Boxes Only, or press B in the viewport, while you lay out a street. Lower Tube Detail for a heavier scene.
The node cooks on every frame
Check Animate Flicker in SOPs. Turning it off moves the blink back into the material, and the node stops being time dependent.
The Signs list is empty but signs exist in the scene
Press Rebuild List from Signs to give every sign already in the scene a card.
A Done Editing button appeared
An edit was started and not finished. Press it to call off the edit.