Hi Kevin, I've been trying to post this answer for hours, but keep getting a bogus error message about "post flooding." I had tried two different Pr 15.2 projects with Sony .MXF and a Sony FS9 .MXF sources from different shooters. Just this morning, I updated Pr to 15.4, loaded a project with Canon .MXF, and that's when I got the Event errors and kernel panic, almost immediately. I was able to do captions on two 15.2 projects by importing an H264 / MP4 exported from Pr 14.x. The ability to Save an SRT from the Captions Tab was still broken (Save button grayed out), but I was able to make them with the old-school Export Movie / Captions function. So, you may be onto something associating the issue with certain footage types, namely .MXF. BTW, I know the drill with Pr, and I've done the troubleshooting routine: delete prefs, reinstall apps multiple times, reinstall OS, trash cache, previews, etc. Thanks for your interest. MacPro7,1 - 2.7 GHz 24-Core Intel Xeon W - 256G RAM - AMD Radeon Pro Vega II 32 GB ATTO R680 PCIe SAS SCSI RAID6 (8 drives) OSX 10.15.7
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