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You cannot enable HIDPI for your native resolution(3440 * 1440) You need to add a new logic resolution that ideally is half of height and width(1720 * 720) of your...

Is 1720 * 720 useable and which GPU are you on? In order to do a proper HIDPI for 2560x1080 the GPU must be able to render pixels at 5120...

This is likely being caused by https://github.com/usr-sse2/RDM/issues/15. I have running into the same issue of yours after install the newest version. You can try to patch the newest PR: https://github.com/usr-sse2/RDM/pull/19...

I guess you already resolved the saving issues. If you have not, you can get it writeable via sudo mount -uw/ killall Finder I can work without issues in newest...