I updated to 3.12.3 and had the same problem where I couldn’t select any printing or material settings. It freezes on “Loading model” when adding multiple. Opened an issue on Github and found the solution. https://github.com/Snapmaker/Luban/issues/674 which, if you’re using Windows, is to delete the folder C:\Users\[Your Windows User Profile]\AppData\Roaming\snapmaker-luban and then just relaunch Luban. This will revert back to default and delete all your custom profiles, but you can maybe try recovering your old profiles from that deleted folder (I have yet to try).
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