Hi, tfeschuk. We're aware of the situation, and our engineers are working to restore full functionality as soon as possible.
In the meantime, you'll want to log out and back in or try a different supported browser to restore the missing sales tax column. For any previously created transactions, you'll also need to open and re-save them to update the tax amounts.
If the issue persists, you may contact our Live Support team for immediate assistance.
If there's anything I can assist you with, let me know in the comments below.
