After installation first couple of attempts to open have had a “fatal error” and subsequent tries just hang at the splash screen and spin the fans up indefinitely. OS 15.5
Hi - we’ve had a couple of other reports of this for Intel machines and are working on a fix. Can you tell us the exact machine/configuration you’re on?
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I try to run the new experimental build on macOS 15.5. Intel (iMac 2020) but always end up stuck with the splash screen and loading indicator at 100%. Whatever I do it won’t start 
I moved your topic here since the conversation has already been started. Can you also tell us the exact machine/configuration you’re on?
ame problem here — after a while, it starts consuming a lot of virtual RAM.
Here is a screenshot showing what happened 10–20 seconds after starting:
After I killed the processes, the next time I tried to start the program, it showed a startup error and saved a Crash Autosave file:
CrashAutoSave.NewProject.1.toe (3.3 KB)
The machine is: iMac 2020 Intel Core i9 with 16GB RAM and AMD Radeon Pro 5500 XT with 8 GB of RAM. Os is Sequoia 15.5
Thanks @boz for the report, it does seem to be an issue for any AMD Radeon M-series Macintosh, so your report is consistent with that. We’re working on a fix.
It would still be great help to get confirmation of system specs from @bLackburst and @kaleidosdope_visuals, hoping they both have AMD GPUs here as well.
Yes AMD GPU here as well (3,6 GHz Intel Core i9, AMD Radeon Pro 5700 XT, 32GB RAM, Sequoia 15.5 MacOS)
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16" 2019 2.4ghz i9 radeon 5500m and uhd 630