waveshell is something related to waves plugins, search for ‘error’ in the log file to get better hints on what could be wrong. No need to send it to the devs anymore as you have succesfully shared the file above 
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I see a lot of mentions on;
“File IO error while reading the plugin bridge component list (Error: Failed to open the file for reading)”
…in the log, perhaps related to Synth1?
I think Catalina is 64 bit only no? So if Synth1 is 32 bit, it wont be bridged properly?