Running PS cc up to date (current) on windows 7 64 bit (current)
The new PS cc seems to leave a blank progress dialog box open and maybe orphaned or something in this scenario:
Doing Focus Stacking, with 6 images on layers and after running:
Edit/ auto align layers
--- followed by
Edit/ auto blend layers
The dialog box shown in the attached image lingers seemingly until I close it.
I allowed it to linger for over 1/2 hr.