Dynamics 365 forms loading forever after the upgrade? here's a fix

If your dynamics 365 forms are loading forever after the upgrade to Dynamics 365, try clearing the cache on the browser, the pages should start to load fine after that.

We had the above issue at a clients, and the solution above fixed it.

My theory is that its cookies left behind by the previous version of CRM confusing the application and clearing the cache loads new and updated cookies that are compatible with the new version.