We are getting: Description should be modified during this transition.

[Dana]

However we are updating the description.  This just started happening today.  Help!

[Nic Brough -Adaptavist-]

It sounds like you have a validator from an app that is requiring a change to description on this transition.  You should check the config for that validator, it may be that one of your admins has changed it, or possibly done something like remove the description field, so your transition can't change it.