I also had problems with the October iso. Gnome, budgie, deepin desktop would not start up after logging in. Just a white screen and cursor. Like you installing from the August iso solved it
i think it would help so much since endeavouros is a rolling release, iso is basicly just updated on packages and kernel, theoretical its pure theoretical i say, as example 
you install from august is fine while october doesnāt that means after all updates it should not work as it is. will see the minor difference of those offcourse , but i got a theory but in vbox could not remake the issue. i think rater you can have in the november release also those issue because lack of feedback i supposeā¦
if the test doesnt work again then check for me .xprofile uncheck it then after the failā¦
Today I have made a complete new install with the december version.
And, hooray, this time Gnome is working fine!
there was an GNOME update in between 
I have not tried a newly installation with the new Gnome version.
All my PCs are already installed with EOS and Gnome and are all running fine.
Hello @marteng69
No worries with rolling release you may already have the updated Gnome version 3.36