I’ve just upgraded my Mac to Tahoe 26.0 and so far (fingers crossed) I don’t see any real issues with Notenik. The Notenik app icon is currently in “icon jail” (a surrounding grey box) because it has not yet been converted to the new format introduced with the ‘26 releases. However I notice several other well-respected apps (such as BBEdit) are in a similar state, so I’m not too worried about that for now.
If anyone finds any other issues, please let me know by posting something here.
Thanks!