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Tried new version of After Effects 2022. Loaded project I was working on, tried to add a simple expression to opacity of a layer, program hung up. Eventually got controll back but can't edit the expression OR disable it. Tried reverting back to v18, and now can't do expressions in that version either; resulted in a crash. Tried uninstall / reinstall with same result. Tried reset permissions with same result. What do I need to delete to get expression use back in After Effects at all?
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Noticed there was also an error that crashed the system when I went into preferences 'Scripting & Expressions'. The Expressions preview window example wasn't rendereing correctly. I restarted again clearing preferences. Then closed AE. Then started AE and purged my cache folders. Found there was an update for JAVA and installed it. Restarted AE and now I have controll of Expressions again. Not sure which of those steps was the fix, but for anyone else who gets stuck maybe it will help.
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Could you be more specific about which "JAVA update" you are talking about?
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Specifically updating JAVA on my Windows computer from www.java.com.