MBAir Mid2013/Sonoma14.3.1: simple graphics make system irresponsive

We've got OCLP 1.4 installed om a MacBook Air 13.3" Mid 2013 running Sonoma 14.3.1. This Mac features a 1.3 GHz Dualcore i5 processor and a Intel HD Graphics 5000 1536 MB.

However, a few days ago, the system suddenly started to behave differently after a reboot. It now has significant problems loading simple system graphics, such as the 'genie effect' when minimizing a window, and becomes unresponsive for several seconds. It takes a while to react, and everything becomes blocky. Additionally, the dock is no longer transparent. It now has a black box with a white outline.

We are not aware of any updates performed after the reboot; it seemed like a simple restart.

To try to resolve the issue, I updated OCLP from version 1.4.x to 1.5. Although it's now running OCLP 1.5, the problem persists. I also reinstalled the post-install Root Patch and redid the 'Build and Install OpenCore' steps, but none of these steps made a difference. Of course I also rebooted the system a few times.

Does anyone have any ideas on what else we can try to make the Mac usable again?

submitted by /u/brammauris
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