Weird Quick Look dialogue box in High Sierra

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celliott wrote: …they seem to take forever to generate a Quick Look file when I have windows set up in column format. I click on a file and get the spinning beachball. Also, hitting the space bar which is supposed to open the file in Quick Look takes forever in High Sierra. Not sure why.…I get the following dialogue box:

'Use of the requested Audio Unit(s) require lowering the security settings for “QuickLookUIService”. Are you sure you want to proceed?'

Well, that's why! The question is why does your system have apparent permission/security settings problems with Audio Units.

Start your hunt here: https://support.apple.com/en-us/HT201532

anyone know why Quick Look takes so long to work?

See above.