(System Preferences > Display > Color tab. It too has a custom profile assigned, and changing the external display profile to Color LCD fixed the issue there as well. When I connect an external display, the black squares come back if I move the Notes window onto that desktop. Doing so seems to have resolved this issue on the MacBook screen. Since I have a custom color profile that was created prior to the upgrade, I reverted back to the default Color LCD profile. In my case, when using checklist items in the Notes app, the unchecked items appear as small black squares. I seem to be experiencing a similar issue with areas of the screen showing black squares. I also have an Early 2011 MacBook Pro with the Intel HD Graphics 3000 512 MB graphics card. You can find some details on MacRumors forum:īlack, box, square, graphic, problem, issue, Mail, Safari, High Sierra, 10.13, 2011, MacBook Pro You can avoid the issue in Mail disabling the conversation mode (Organize by Conversations). Some of them, solved the problem using the Calibrators software that you can find in the preference panes. Some people had this problem with the native color profile. Switching between spaces (with 3 fingers using the trackpad) lets appear temporarily the issue in some area. Note that the issue can be partial and may appear intermittently as when using Spaces, for example. Using third party calibration profiles: ISSUE (vary according to the selected profile) Using personal calibration profile: ISSUE

Using the native Apple LCD profile: PARTIAL ISSUES (may appear temporarily, etc.)

Switching between graphic cards resolve temporary the issue: The more critical is Mail, you just can't read mail at all. I observed the problem in at least 4 different applications, most being official Apple software. using a MacBook Pro early 2011 with the integrated graphic card. Some graphic elements are replaced by black areas in applications like Mail, Finder, Safari, etc.

Hd graphics 3000