Try the following strategy:
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- Rename the VST3 folder to let’s say _VST3
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- Create a new, empty folder named VST3
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- Then move half of all the plug-ins from _VST3 to VST3 and start and stop Dorico again
- If it started fine, you continue with step 3.
- If it did not start, you move half of the plug-ins you just moved to the VST3 out again and check Dorico’s start-up behaviour.
Do you get the principle? By always moving a half you can relatively quickly find the offending item even if you have lots of plug-ins.
Please also share with us your final findings.