Moving to version 4 from the previous version
This page lists any items in version 4 that require the attention of existing users. There aren't many changes but you should regard every item here as something that you need to do.
The previous method of colour schemes has been replaced with a much more versatile system. You will need to visit Set Display to set your preferred colours again.
Some items have been renamed, some have new security settings (previously covered by another) and generally the security settings have been changed to make them more logical.
You should visit this page and review the settings for each of the admin users.