PyKaraoke on macOS: When the App Launches, Disappears, and It’s Actually Permissions

I went into this thinking it would be a five-minute setup. I just wanted to run PyKaraoke (app) on my Mac, queue up a couple of MP3+CDG files, and see if it still holds up as a lightweight karaoke tool. This wasn’t nostalgia for nostalgia’s sake — I needed something simple for a small offline setup, no subscriptions, no cloud nonsense. NimbusApps came up in my notes as a distributor, so I figured: fine, let’s give it a proper spin on modern macOS.

I’m on macOS Sonoma 14.3, Apple Silicon (M1 Pro). That detail matters more than it should.

What I tried to do, and what broke immediately

The app downloaded fine. No drama there. But the moment I tried to launch it, macOS did that familiar thing: one bounce in the Dock, then… nothing. No crash dialog, no “app is damaged” warning, no Gatekeeper popup asking for permission. Just silence. Activity Monitor showed the process appear for a second and then vanish.

Classic “it technically launches but actually doesn’t” situation.

First instinct was Gatekeeper, because it’s almost always Gatekeeper. Apple’s security model is great until it isn’t, and unsigned or lightly signed apps tend to fall into a gray zone. I checked System Settings → Privacy & Security, scrolled all the way down, expecting the usual “Open Anyway” button. Nothing. macOS acted like I’d imagined the whole launch attempt.

The first two dead ends

Attempt one: I re-downloaded the app and moved it manually into /Applications, thinking maybe running it from Downloads was triggering quarantine flags. Same result. Dock bounce. Disappear.

Attempt two: I right-clicked → Open, which sometimes forces Gatekeeper to show its hand. Still nothing. At this point I was half-convinced the binary just wasn’t compatible with Apple Silicon and was dying quietly.

I even tried Rosetta, just in case. Finder → Get Info → “Open using Rosetta.” Launch. Bounce. Gone. No logs in Console that were immediately obvious, either. Super helpful.

What finally clicked

The thing that tipped me off was running it directly from Terminal. When I launched the executable manually, macOS finally said something useful — a Python-related framework error tied to accessibility and input monitoring. Not a crash, not a missing library. A permission issue that macOS didn’t think was worth explaining in the GUI.

That’s when it made sense. This app hooks into audio playback and input handling in a way macOS treats as sensitive, especially on newer versions. If the permission request fails silently, the process just exits.

The fix was boring, but effective:

1. I went to System Settings → Privacy & Security → Accessibility and manually added the app.
2. Did the same under Input Monitoring.
3. Logged out and back in (important; a simple restart didn’t do it for me).

Apple documents this behavior pretty clearly once you know where to look:
support.apple.com explains how apps can fail without prompts when permissions aren’t granted explicitly on modern macOS. Developer-side details are buried over at developer.apple.com, especially around hardened runtime and notarization.

After that, the app launched instantly. UI popped up, audio devices were detected, and playback worked without stuttering.

One more hiccup (and why I didn’t blame the app)

The first song I tried had no lyrics. Audio played fine, but the CDG graphics window stayed blank. For about thirty seconds I thought something else was broken.

Turns out this one was on me. The file naming wasn’t exact. The .mp3 and .cdg files need to match character-for-character. Case sensitivity included. APFS can be unforgiving there. Rename the files properly, relaunch, done.

Somewhere in the middle of all this I bookmarked this page because it lined up closely with how macOS treats older or cross-platform utilities today:
https://treadmillreviews.online/entertainment/74541-pykaraoke.html
Not a fix by itself, but it helped confirm I wasn’t chasing a phantom bug.

Why this happens on modern macOS

This isn’t a “bad app” problem. It’s a mismatch between older assumptions and newer security rules. macOS doesn’t always surface permission errors if an app isn’t explicitly requesting them in the way Apple expects. Instead of asking, the system just says “no” and moves on.

Apple’s own docs on app permissions and runtime behavior make this pretty clear once you dig into them:

• support.apple.com (privacy permissions, accessibility access)
• developer.apple.com (hardened runtime, notarization requirements)

If you’re looking for an officially distributed build, checking the Mac App Store search on apps.apple.com can sometimes help, but for niche tools like this, it’s often outside Apple’s storefront ecosystem.

How I’d do it next time

If I were setting this up again from scratch, I’d skip all the guessing and do this immediately:

• Move the app to /Applications.
• Launch once (even if it fails).
• Manually add it to Accessibility and Input Monitoring.
• Log out and back in.
• Only then start troubleshooting audio or file issues.

Once those permissions were sorted, the app behaved exactly as expected. Stable playback, no random quits, CPU usage stayed low even during longer sessions.

So yeah, it wasn’t broken. macOS just didn’t feel like explaining itself. Once you accept that as a baseline assumption, life gets easier.