Hi everyone, I had the same problem with the 2020 version. I tried various solutions from this thread, but none seemed to work (probably because I was doing something wrong).
Poking around the forums though, I found a solution to a similar problem for Photoshop extensions, you can find the original post here
It worked for me! Basically it's enough to prepare a text file with just written in it:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Adobe\CSXS.6]
"PlayerDebugMode"="1"
[HKEY_CURRENT_USER\Software\Adobe\CSXS.7]
"PlayerDebugMode"="1"
[HKEY_CURRENT_USER\Software\Adobe\CSXS.8]
"PlayerDebugMode"="1"
[HKEY_CURRENT_USER\Software\Adobe\CSXS.9]
"PlayerDebugMode"="1"
[HKEY_CURRENT_USER\Software\Adobe\CSXS.10]
"PlayerDebugMode"="1"
Then you save it as .reg file (literally change the .txt in the back into .reg and save). Then double click on it to run and then restart After Effects.
I think for older versions just omit the last lines (from the one with CSXS.10 for 2019, from CSXS.9 for 2018 and so on).
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