This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
A Blueprint marked Dirty will appear in the Windows Task Bar with an asterisk beside its name. Saving this Blueprint will remove the Dirty flag, but the Task Bar will continue to show the BP as Dirty until focus is returned to the BP.
1. Open any project
2. Open any Blueprint
3. Make any change to mark the Blueprint Dirty
5. Note the asterisk beside the BP tab in the Windows Task Bar (you must have the Taskbar Buttons set to Never Combine)
6. Save the Blueprint
The BP tab in the Windows Task Bar is still marked with an asterisk until focus is returned to the BP.
Head over to the existing Questions & Answers thread and let us know what's up.