Plugin won't load in Premiere

Sandboxing, version mismatch, cache reset. The fix tree for the most common install failure mode.

The MOVON panel installs as a UXP extension and runs a small local backend on the Mac. When the panel does not show up in Premiere, one of three things is in the way: macOS sandboxing, a Premiere extensions reload, or the backend process. This page walks the three.

Confirm the panel is supposed to be there

In Premiere, open Window → Extensions. If "MOVON Match" is listed but greyed out, the install completed but Premiere is not loading it. If it is missing entirely, the install did not register the extension. The fixes are different for each, below.

1. macOS sandbox blocked the install

This is the most common cause on a fresh install. macOS Gatekeeper holds the installer in quarantine until it is explicitly allowed.

• Open System Settings → Privacy & Security.
• Scroll to the Security section. If a "MOVON Match was blocked" line is there, click Open Anyway or Allow.
• Quit Premiere, then re-run the installer.

If the installer was downloaded with a browser other than Safari, the quarantine attribute can persist. The installer reports a clear error in that case; the fix is the same: allow the installer in Privacy & Security, then re-run.

2. Premiere did not reload the extensions list

UXP extensions register at Premiere launch. If MOVON installed while Premiere was open, Premiere will not see it until the next launch.

• Quit Premiere completely (Cmd+Q, not just closing the window).
• Re-open Premiere.
• Check Window → Extensions again.

If the panel is now listed but still not opening, move on to step 3.

3. The local backend is not running

MOVON's match engine runs as a small local FastAPI process beside the panel. The UXP panel talks to it over localhost. If the backend is not running, the panel loads but reports a connection error on Analyze.

• Open Activity Monitor and search for "movon" or "movon-backend".
• If no process is running, re-run the MOVON installer. The installer registers the backend as a LaunchAgent that starts at login.
• Sign out and back in to macOS, or run the LaunchAgent manually.

The panel itself will load even when the backend is down, so a panel that opens but cannot Analyze is almost always a backend issue, not a UXP issue.

Older Premiere versions

The UXP panel targets modern Premiere. On older Premiere builds, a CEP fallback panel may be needed. If Premiere does not see the UXP panel at all and the macOS sandbox checks pass, the Premiere version may be the cause. The Install doc lists the supported range.

Reset Premiere's extension cache

If the panel still refuses to load after the three steps above, Premiere's preferences may have a stale cache:

• Quit Premiere.
• Hold Option + Shift while re-opening Premiere. A dialog asks to reset preferences. Confirm.
• Re-check Window → Extensions.

This resets non-MOVON Premiere preferences too, so it is the last resort, not the first.

Send a report

Still stuck? The homepage Contact form reaches MOVON Labs directly. A short note with the Premiere version, the macOS version, and what step above was tried last is usually enough to diagnose.