# Binder: Troubleshooting

> When a binding does not paint.

Glider documentation · Data · Web page: https://cgglider.com/docs/binder/troubleshooting/

Sections of this page: [How binding works](https://cgglider.com/docs/binder.md) · [Sources](https://cgglider.com/docs/binder/sources.md) · [Live feeds](https://cgglider.com/docs/binder/feeds.md) · [Sheets](https://cgglider.com/docs/binder/sheets.md) · [Action binding](https://cgglider.com/docs/binder/actions.md) · [Troubleshooting](https://cgglider.com/docs/binder/troubleshooting.md)

| Symptom | Likely cause |
| --- | --- |
| Clicking a key does nothing | No slot is armed — the header shows the idle text rather than “Connecting …”. |
| Visibility is inverted | A binding onto hidden reads truthy as hidden. A toggle labelled “visible” needs the invert flag; the editor sets it for visibility paths. |
| The field paints but flickers | Two writers on one path, or a unit writing every tick. Check the unit report. |
| Blank on air, fine in the editor | A guard is holding — onMissing of hold, blank or zero decides what a missing value paints. |
| A feed field is greyed out | That poller is disabled. Enable it in Units. |

Truthiness for a hidden binding is deliberately generous: true, 1, "1", "true" and "on" read as true; false, 0, "0", "false", "off", empty string and null read as false. Anything else falls back to JavaScript truthiness.