please let me know when its back and working again. thanks …
Hello again Florian, thank you for your post 
To better understand what’s going on - did the steps suggested in the screenshot you’ve attached help?
Thank you again,
yes, i have followed screenshot suggestions. no change. same error. any plan for a fast fix? not fun its broken again. 
Thank you for the quick reply
For now this looks like something on InDesign’s side, since the error started popping up only after the update and there were no FontBase plugin changes recently as far as I know. Did InDesign’s support provide any guidance on what could have caused this?
But of course we’ll look into this error on our end as well
Thank you again,
UPD: ran a quick Google search on this, the second link https://community.adobe.com/t5/indesign-discussions/adobe-indesign-cc-startup-alert-plugins-not-valid/m-p/5516151 provided a possible cause on InDesign’s side and a suggestion on how this could be resolved, hope this helps
indesign works without any issues. stop blaming them. its obviusly another fontbase problem again.
and your link doesnt help, its from 2013 and for mac. sorry to say.
and would be nice if i dont have to wait 30 minutes for every answer. all this is so ridiculous…
There was an issue with external plugins. InDesign 20.3.1 fixes it.
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thanks for pointing out - but i am using the latest version already. thats the problem.
Not having any issue here, is there a particular sequence you are doing when that error pops up? I could try.