Why does Logic Pro freeze?
A third-party Audio Unit can leave Logic Pro not responding during playback, a bounce, or project load. An older plugin can deadlock or leak threads after an update. A spinning beachball means you need to establish whether Logic is hung or a process has actually crashed.
Logic spinning beachball or an unstable Audio Unit?
A frozen Logic session stays open but stops responding. A crash is when Logic quits unexpectedly. An “Audio Unit plug-in has become unstable” warning is another clue people encounter, but it may not name the AU. The warning alone does not establish whether Logic or its separate plugin host crashed.
If the app or plugin host actually crashed, look for its crash report. If Logic is still running and hung, capture that hang before force-quitting. DAW Defrost captures running freezes; it does not analyze crash reports after an app has quit.
Free checks before replacing plugins
- After an actual crash, open Console. In Crash Reports, look for Logic Pro or an AUHostingService report matching the time of the failure. If Apple's separate plugin host crashed, its report may be the relevant one even if Logic stayed open. A plugin named in a report is a lead to investigate with the vendor, not a guarantee that every future freeze has the same cause.
- Try Audio Units safe mode. Launch Logic and hold Shift-Control until it opens or a dialog appears. This loads only validated Audio Units; a validated plugin can still misbehave. To test without any Audio Units, Apple's startup options also include holding Control and choosing Launch Without Audio Units. See Apple's startup modifier instructions.
- Check Plug-In Manager. Look for failed validation or incompatibility flags and disable the suspect AU. Test a copy of the project with that plugin removed, then repeat the same playback or bounce. Check the vendor for a version compatible with your macOS and Logic version. See Apple's guide to disabling or removing Audio Units.
If a project won't open, a hang during load and an immediate quit are different cases. Safe mode can help isolate a load problem; an immediate quit needs crash-report troubleshooting. Keep your original project and test changes in a copy.
When Logic is still open but frozen
macOS writes a crash report when an app crashes, not when it merely hangs. Force-quitting loses the live evidence. DAW Defrost watches from the menu bar and checks responsiveness every 15 seconds. After Logic stops responding for 30 seconds, it snapshots the frozen process and reads which plugin's code the threads are stuck in.
For Logic Pro and GarageBand, it also inspects Apple's separate plugin host processes, where Logic sometimes runs third-party plugins. A popup names the third-party plugin, and a full technical report is saved to Documents ▸ DAW Defrost Reports.
It names the cause; it does not fix the freeze, update a plugin, or bypass it for you. The usual fix is a vendor update or bypassing that plugin on the track. DAW Defrost requires an Apple silicon Mac (M1 or later) and macOS 13 or newer, runs locally without uploads, and comes with Session BPM for $19 one time.
Common questions
Why does Logic Pro keep freezing?
A third-party Audio Unit can deadlock or leak threads, sometimes after a macOS or plugin update. Logic may stop responding during playback, bounce, or loading. Isolate plugins to confirm the cause rather than assuming every beachball is the same problem.
How do I find which plugin crashed my Logic session?
After a true crash, check Console for a Logic Pro or AUHostingService crash report at the time of the failure. If Logic is still running but frozen, DAW Defrost captures the hang and names the third-party plugin on a supported Mac.
Does Audio Units safe mode disable every plugin?
No. Shift-Control at launch enables only validated Audio Units. To test with all Audio Units disabled, use Control at launch and choose Launch Without Audio Units.
Can DAW Defrost help if my Logic project won't open?
Yes if Logic launches and then hangs during loading. No if Logic quits immediately. DAW Defrost captures a running hang and does not read crash reports after the app has quit.
Does it inspect Logic's separate plugin hosts?
Yes. For Logic Pro and GarageBand, DAW Defrost also inspects Apple's separate plugin host processes. It requires an Apple silicon Mac (M1 or later) and macOS 13 or newer.
DAW Defrost + Session BPM. One-time purchase, no subscription. DAW Defrost requires an Apple silicon Mac (M1 or later) and macOS 13 or newer.
Get both apps for $19Keep reading
Why Ableton freezes · Find the plugin behind a crash or freeze