Premiere crashes opening iterative saves of a specific project

Question

I've suddenly found that attempting to open a specific collection of project files consistently crashes Premiere and I cannot figure out how to fix it!

These files (all iterative manual saves of the same project) were originally authored between July and December 2023 using Premiere Pro 2022 on an Apple M1. I have attempted opening them using both Pr2022 and Pr2024, but I get the same crash with both.

Things already attempted without success:

creating a new project and importing the old sequences (this either fails or crashes Premiere)
opening auto-saves of the project (same result)
resetting all preferences and plugin cache, deleting media cache, disabling 3rd-party plugins, etc (has no noticeable effect)

Curiously, all of these files functioned perfectly well as recently as March 2024. Even more curiously, I can get some of the earliest iterative saves of this project to open successfully, which suggests to me that the culprit must be some effect/plugin/workspace I used in later versions of the project, but I can't for the life of me figure out what that might have been or how to fix it.

Any recommendations?

daniel_8503 · Accepted Answer

UPDATE: Found the culprit.An audio plugin that I'd used in a few sequences had apparently been broken by macOS's Sequoia 15.4 update and required patching (details here). I'm not sure why Premiere's "disable 3rd party plugins" launch options had no effect on the crash, but we were able to load the project file on a different machine that didn't have the plugin installed, and updating the plugin ultimately fixed the issue.

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