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Admin FactorAdmin Factor 

We changed the domain to a customized one and there's an error when users save registers

Since last Thursday when we changed the Salesforce domain to our-company-name, users are experimenting an untraceable error in Salesforce:
Task:
User-added image
Opportunity:
User-added image
Throughout the day, they are getting a message like “The page you sent was not valid for your session. Update your page and try again.” (I am attaching two pictures in Spanish). They have to cancel the edition, update the page and try again, and then it works.

We have never seen it before; there is no information in our Developer Console log. Can anybody help us?

Thank you!
ShirishaShirisha (Salesforce Developers) 
Hi,

Greetings!

It could be because the urls might be redirecting the user to the old domain which is no longer valid.I would suggest you to double check the URL which they have bookmarked or trying to access is updated or not.

Please mark it as best answer if it helps you to fix the issue.

Thank you!

Regards,
Shirisha Pathuri