Thanks for the information provided to the Illustrator team.
We are able to reproduce this issue at our end and the engineering team is currently isolating this issue further to get to the root cause.
With Best Regards,
An error occurred while saving the commentKris commented
I'm having the same problem on my Mac, pressing H and V did not fix the problem. I don't use Safari, so this isn't the problem, but just for kicks, I opened it and shut it down. It did nothing to fix the problem. I use the space bar hand tool a lot and this is very inconvenient.