When trying to edit the "Assigned to"“ field in the database item.
Getting error message "Unfortunately, eRoom was unable to process this dialog, because you do not have rights to it."
Every time environment have a deleted user with explicit rights, eRoom tends to have problems with that.
Uncheck the deleted user and added another active user. And Uncheck the read only and checked "everyone who can open the step".
Also refer to Knowledgebase solution ID 175688 for more information on the issue.