Ghost window (procedure window) appears in saved experiments

We are unable to reproduce this problem.  It would help if you could report this to support@wavemetrics.com.  If possible please compress and attach a copy of the experiment in which this happens.

A.G.

This issue was reported to tech support as well. Here is the answer I gave there:
 

This appears to be a manifestation of a known problem caused by an interaction between the Qt framework and recent versions of Mac OS- if a window is destroyed while docked, it isn't actually destroyed. The Qt parts of the window are destroyed (hence the "ghost" appearance) but the actual Mac OS window is not destroyed. It is this problem that requires the (somewhat annoying) behavior of all your docked windows being un-docked when you shut down Igor. Apparently you have found a corner case not covered by my work-around.

As far as I can tell, the ghost windows don't cause a problem for operation of Igor. I believe if you click the close button, the window will close and no harm is done. This is another case of Apple taking preemptive actions that are hard for small developers to keep up with, especially in an application as large and complicated as Igor.

I see you are using the latest release version of Igor. That gives you the best chance of using Igor on recent Macintosh hardware with few problems. But I urge you read our disclaimers here (it actually applies to any recent version of Mac OS): https://www.wavemetrics.com/faq/igor-pro-macos-1015-catalina-110-big-sur-and-120-monterey. Another problem with Mac OS is covered here: https://www.wavemetrics.com/faq/why-do-i-get-unexpected-results-when-using-igor-pro-7-spaces-macintosh-os-x-0