KERNING ON EXTENDED SELECTIONS...
My kerning worked just fine about an hour ago, but now every time I try to add a custom kerning value it gives me the warning: Kerning on extended selections can only be set to Auto or 0.
I can't seem to get this to go away.
I uninstalled & reinstalled Illustrator and it is still happening.
I tried many fonts of different types, and it still won't work.
-Chris

We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in update.
Or get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html
Warm Regards,
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.
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Anonymous commented
I have this exact same problem. Every time I open the kerning window the error appears and clicking OK does nothing, so the software is locked up. I have to force quit every time. Started after updating to CC 2018.
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Jonathan Anderson commented
Every time I open the kerning window the error appears and clicking OK does nothing, so the software is locked up. I have to force quit every time. Started after updating to CC 2018.
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Sean commented
I can no longer access the dropdown menu for Kerning, Leading, or Character Rotation. On Leading and Rotation I can arrow up and down through the drop down options in the numeric entry window, but when I do this with Kerning I get an error that reads "Kerning on extended selections can only be set to Auto or 0. To modify spacing between multiple characters, use the Tracking option." I can no longer set a line of text to Optical or a specific kerning for the line like I used to.
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Laura commented
OK... I figured it out. (Turns out it's wise to read the entire error message, oops.) You need to use the "Tracking" option instead of kerning. The icon is very similar to kerning, but the text is black on white instead of white on black. It's directly to the right of the kerning option.
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Laura commented
Having the same problem... Looking for a solution.