P: unknown error while writing metadata to this photo

No that is not the solution to my problem.
This is how I see the problem.when ps2018 opens a document I can rotate it. But as soon as I hit the B key it breaks the link.
I believe that at that point PS is screwing the command up. The eyedropper flashes where the cursor was and the underscores on the top menu line flashes under the first letters. Eg F for file E for edit.
I do not know what Wacom sends to rotate but it is almost like ALT something. Now we know Adobe has screwed up the ALT commands like ALT backspace and this looks like the same problem but because of the wheel/slider happens a lot very quickly.

I fixed the problem by turning the OpenGL support on in my preferences.

I followed the steps listed here - https://helpx.adobe.com/photoshop/kb/gpu-opengl-features-preferences-photoshop.html

This problem with the rotate not working is happening to me on win 8.1
I am running a cintiq 22 hd with the latest driver.
I start ps 2018 and bring up a document and the rotate will work but if I hit B for brush draw a line then rotate will not work again.
Go back to Ps2017 and it all works ok.
This looks like an Adobe problem.

Thank you Mike Shaw for your response.  The only problem I am having is that the Rotate function does not work on my Intuous Large tablet. I am running Windows 10, and when I spoke with the Wacom tech he confirmed I have the latest drivers. He also had me reset preferences but that did not work. We did a few other changes to the Wacom Tablet Properties, but to no avail. My Table worked a few minutes before I updated to Photoshop CC 2018, so it is clearly a problem of Wacom compatibility with CC2018. I intend to go back to my old Wacom tablet to see if that works with CC2018.

For those that are having issues:
What exactly is failing to function?
What OS is being used?
What Wacom driver version is in use?
If running on Win 10 is Windows Ink enabled in the Wacom control panel?
If Windows ink is not being used is the PSUserConfig gestalt being used to revert to the WinTab implementation? If PSUserConfig file was being used in PS2017 was it added to the PS 2018 location?

trouble shooting tips
https://helpx.adobe.com/photoshop/kb/tablet-support-faq-photoshop.html

I think you can. That was what Adobe's assistance recommended to do.

I think the problem is still with the interaction between adobe photoshop 2018 and wacom. Earlier this week, there was an update of Wacom after my complaint and the problems persist. Only solves it when it comes back to the latest version of photoshop. I will wait to correct the error to install the new version.

windows 10 here (creators edition (not my idea)) with a Intuos 4 Large.  I don't care for most of the changes in CC so far.  But the rotate function in PS is my most used tool.  My productivity the last couple weeks is really down.  Tried everything.  Can I go back to the 2017 version?

I'm running PS 2018 on Windows 7 with a Wacom Intuos 4 Medium tablet using driver version 6.3.20-3 with no issues. I'm guessing the users with tablet issues are on OS X or perhaps Windows 10.

I have also spent hours on the telephone to both Adobe and Wacom.  My Wacom Intuos Pro has stopped working altogether since the 2018 photoshop cc was deployed.  I have now had to revert to the 2017 version of photoshop to enable my Wacom to work again.  Unfortunately resetting the tablet preference file did not resolve the issue.