I recently ported my app from the Sequoia SDK to the Tahoe SDK. The app is written in Objective C and does not use ARC.
Everything works well after the major cleanup, except ....
A times I see a small empty window pop up. Clicking out of the application usually gets rid of it.
I can make it happen fairly regularly on an displayed sheet which presents two NSImageView objects. The user clicks on a button which displays a popup menu; modifies an image then applies the results to one or both of the image views.
Having spent two days on this it seems as if the actual setImage on the image view is causing the popup. If I cut out the setImage, it never happens ... even with all other steps in place.
I've disabled all animations and tried dozens of things all to no avail. It is not consistent but I can make it happen on two Macs (both running Tahoe). It never happens on Sequoia or earlier when running the build produced with the Tahoe SDK.
Any suggestions would be appreciated.