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<blockquote data-quote="Randy B. Singer" data-source="post: 1949010" data-attributes="member: 190607">Some things to try that might be diagnostic, and which are easy to do and won't hurt anything:Boot into Safe Mode and see if the problem disappears while in Safe Mode.&nbsp; If the problem is gone while using Safe Mode, the problem is almost certainly caused by software (not hardware) and is due to a stay resident piece of software.&nbsp; Likely something that&nbsp; doesn't come from Apple.&nbsp; e.g. an anti-virus program.<a href="https://macreports.com/how-to-start-your-mac-in-safe-mode/" target="_blank">https://macreports.com/how-to-start-your-mac-in-safe-mode/</a>If that doesn't work, try running the Mac OS's included utility Font Book to both &quot;Validate Fonts&quot; and to &quot;Resolve Duplicates&quot;:<a href="https://support.apple.com/guide/font-book/install-and-validate-fonts-fntbk1000/mac" target="_blank">https://support.apple.com/guide/font-book/install-and-validate-fonts-fntbk1000/mac</a></blockquote>

[QUOTE="Randy B. Singer, post: 1949010, member: 190607"] Some things to try that might be diagnostic, and which are easy to do and won't hurt anything: Boot into Safe Mode and see if the problem disappears while in Safe Mode. If the problem is gone while using Safe Mode, the problem is almost certainly caused by software (not hardware) and is due to a stay resident piece of software. Likely something that doesn't come from Apple. e.g. an anti-virus program. [URL code="true"]https://macreports.com/how-to-start-your-mac-in-safe-mode/[/URL] If that doesn't work, try running the Mac OS's included utility Font Book to both "Validate Fonts" and to "Resolve Duplicates": [URL code="true"]https://support.apple.com/guide/font-book/install-and-validate-fonts-fntbk1000/mac[/URL] [/QUOTE]

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