This site? Pro support is elsewhere; posts here are voluntary.

Default prefs are usally good enough, so you shouldn't need any special settings for OSX. Hard to tell from your post what the problem might be. Some possibilities are corrupt/old prefs--LW has changed so much recently. Too, sounds like you could've tapped into hosts sharing a lot of corrupt files, or your old incompletes are corrupt. I haven't seen the "corrupt" message for a long time.

Generally, I first try a restart or running uninstall (I search and destroy old "limew" files and folders for a complete uninstall), maybe trash the old incomplete folder, when LW seems to misbehave.

Platform/machine/app info can help attract better answers.

Cheers