Hi, i have CC 2017 and when i create a new picture it creates BIG MASSIVE files on my disc, like theese: http://prntscr.com/fram84 they're taking too much space so when i have make a 'New' document/picture i can't edit anything to the transparent background because everytime i try do things it says my disc space is full.
What operating system are you using?
Have you updated photoshop cc 2017 to version 2017.1.1?
The update might fix that.
You can check the version in photoshop by going to Help>System Info and top line is the photoshop version.
If your not updated to 2017.1.1 then go to Help>Updates.
I have Windows 10, and the latest version of cc 2017 (1.1)
There have been reports of this still happening with photoshop cc 2017.1.1 which was supposed to fix that issue.
You should post here and see what adobe says: