Same problem here.
My hole business is not working cause of this problem. So I loose ever day a lot of money.
First with a downgrade it works. 4.7.8 now I could not downgrade anymore.
Why you take not out 4.7.8 and rename it to 4.8.1 for upgrade.
So the system can upgrade and problems are first solved.
Then you can work at the new version.
Ok thanks. With the old version it works.
Have the same problem at all of my forms.
The arrows are rotating after you click send and nothing happens.
