i have the same problems with Kaspersky Internet Security 2020 and the (e) updates. I have higher hopes that the Malwarebytes guys will respond to a problem caused by another software than over Kaspersky so im gonna post here too.
Ive done some testing - even with virtual machines (so not a hardware problem etc.). Everytime Kaspersky updates to version (e) i cannot start Firefox, Thunderbird and some other programs. Chrome seems to be running just fine...
I didnt test all the exclusions in both AVs. But i tested it with on/off settings of Malwarebytes (newest Version on Windows, Windows 10 Home running btw). With "Ransomware protection" off everything works fine. With on i have the same problems like the other guys here.