Following migration to TestComplete 14.61 and Firefox 81, pages and objects are no longer recognized

Hello everyone,

I have a problem because on my automatic test development machine, I was with TesComplete 14.60 and Firefox 77 and everything worked perfectly.

Having updated TestComplete to version 14.61, I saw that it supports Firefox version 81 (https://support.smartbear.com/downloads/testcomplete/firefox-patches/).
I didn't check that TestComplete was still compatible with Firefox 77 and I updated Firefox to version 81.

Result, pages and objects are no longer recognized 😪.

On the same machine, TestComplete 14.61 is still compatible with Chrome 80 🤔

I rechecked the Firefox settings (https://support.smartbear.com/testcomplete/docs/app-testing/web/general/preparing-browsers/firefox.html) and everything is okay.

Where can the problem come from ?

I tried to reinstall Firefox 77 but that doesn't work anymore either.

thank you for your help