Could you please let us know which version of Photoshop are you using?
For the coresync error please try the steps mentioned on this link:
Adobe Creative Cloud Core Sync crashes every minute after update
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This is a bit unclear - do you still have CC2017 installed? IOW you unchecked "remove old versions" in the CC installer? Does it behave normally?
Please - If you're saying they should check "remove old versions", you should say that.
I apologize for the misunderstanding.
my name is Alexis, and I've been experiencing the same. I have Photoshop and Lightroom 2018. Until last week, I was able to drag any file (.JPG) into the work space of both softwares and start working on them right away. Now The software will open but never display any file on the work space. Everytime I minimize and maximize the window size of the software, it will glitch and start creating a mess on the window space mixing tool bars on the crashed window.
I've tried unistalled and reinstalled the software already but with no success. Please get back to me ASAP.