This is probably a silly question, but have you double checked the Creative Cloud desktop app Apps tab to see if there's an update available for Camera RAW?
I have the exact same problem. Upgraded everything today to the latest versions through the Adobe Creative Cloud app. Photoshop CC 2018 works fine. If I call camera raw as a filter it will freeze up when I close camera raw.
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I have a fix that worked for me.
My first reaction was to deactivate de video card acceleration in Photoshop. That didn't help...
I then found that I can deactivate the same feature for Camera Raw in Bridge.
Go to BRIDGE - EDIT - CAMERA RAW PREFERENCES
All the way at the bottom you will find PERFORMANCE. Uncheck USE GRAPHICS PROCESSOR.
Hope it works for you as well as it did for me...
Disabling acceleration doesn't work.
I am running on a Surface Pro 4, and this bug is repeatable on multiple Surface Pro devices that I own.
Downgrading does squat. I've fresh installed windows again with CC 2017, and it still doesn't work!!!
I suspect the current ver. of Camera Raw is at fault, but can't seem to find anywhere to obtain a downgraded version of Camera Raw.
What helped me was to do an alt-control-shift when starting photoshop. I then reset my preferences and it worked. I had tried reinstalling everything, disabling he acceleration, etc. and it didn't work.