why does "core" empty window appear on my desktop from time to time?
From time to time, unpredictably, I get a small empty window appearing on my desktop with the word "core" in the top left corner:

Checking in task manager, "coresync" seems to be using 100% of memory:

I have to shut the computer down to get rid of the process. I believe it may have something to do with Creative Cloud but I don't what it is. My CC version is 2.0.0.74. I am using CC's File Sync.
I am running Windows 7 Pro 64bit OS on my machine and the system appears stable. I am using Photoshop CC 2014 64bit and Dreamweaver CS3. My machine specs are:
CPU 3770K ; an Asus P8Z77-V Deluxe motherboard; 32Gb Crucial DDR memory; a Crucial 256Gb SSD for the OS and programs; x2 Samsung 512Gb 840 Pro SSDs for data; an Asus GTX660 graphics card.
Can anyone help me with this please? Will the problem disappear if I stop File Sync in CC?
Thanks
