Claude, thanks for confirming my suspicions. I like how you assigned tag values in tableViewForColumn, I hadn't thought of that. I think I will use that but assign the same value for all cell views in a given table since my bindings don't need row and col info to do their job. I like your use of multiplexing, which is new to me. Would you mind clarifying a few things? When setting the mux value what is column.? Is the trailing dot a typo? The comment after that line seems to suggest a conditional but I don't see it in your code. When demuxing what is highWordTag? Thanks for the help!

I had the client upgrade to the latest version of MacOS and the issue resolved.

I am having the same issue. I ran into the same error while building and found a solution via Google to use Terminal to navigate (cd) to the folder listed in the error in XCode and then run the following two commands.. xattr -lr . xattr -cr . This works for build/run but when archiving it still throw the error. I cannot archive. Did you end finding a solution?

@Claude31 thanks for the suggestion, it got me headed in the right direction. I did try both of those and the warnings kept pointing me to just use the default NSTableView attributes. I ended up using: @property(assign) idTKTableViewDelegate delegate; I can't remember why I originally set it up as nonatomic and readonly but it was probably some copy and paste from a tutorial or forum help.