We're using Sitecore 8.1 (rev. 160519)
Please download the following Sitecore Support Patch here.
It is a fix about the Field Editor dialog has no header. If the patch does work, I would recommend you to contact Sitecore Support and ask them one which is compatible with your version.
As a side note, Sitecore responded that the patch is compatible with both Sitecore version 8.1 and 8.2.
The Sitecore Patch detail is: Sitecore.Support.1017770. The zip file contains an assembly and a config file.
Place the attached Sitecore.Support.101770.config file to the \App_Config\Include folder.
Place the attached Sitecore.Support.101770.dll assembly to the \bin folder.