Boy this could be several things. I would start with the simple one first. Shut down your computer and start it again. Don't restart it, completely shut it down.
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home made Desktop
OS
Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
CPU
Intel i7-6800K @ 4.3
Motherboard
ASUS X-99 Deluxe II
Memory
Corsair Platinum 16 gig @2400
Graphics Card(s)
EVGA GTX 1070 OC
Monitor(s) Displays
Asus 27" LED LCD/VE278Q
Screen Resolution
1920-1080 or 1280-720 HDMI
Hard Drives
INTEL SSD 730-240 Gb Sata 3.0/
PSU
EVGA Platium 1200W
Case
Phanteks Luxe Tempered Glass 8 fans/ one radiator
Cooling
XSPC/ Water Cooled CPU
Keyboard
Das 4 Professional
Mouse
Logitech M705/MX Anywhere 2-S
Internet Speed
100 mbits
Antivirus
Microsoft Security Essentials/ Malwarebytes Premium 3.0/ SAS
Browser
I.E. 11 default/Firefox/ ISP Time Warner Cable/Spectrum
Other Info
LG BluRay Burner/
Sound system-KLipsch-THX/
Icy Dock ssd Hot Swap bays.
to something else and then try restarting Photoshop. Better yet, move the file to another folder so that you can easily mover it back if it isn't the settings that are the problem. You will loose your custom settings when you move/rename it.
Samsung 850 Pro 256GB (OS), Samsung 2x 128GB 840 Pro SSD in RAID0, 3x WD Blue 6Gb/s 1TB RAID0, WD 2TB Black external USB 3.0, 2TB WD20EARS Green external USB 3.0, 2x 500GB Seagate and 1 750 GB external USB, 1x 350GB external USB3