This article will assist you save new client detail if the page just flashes without saving.
INSTRUCTIONS
After adding client information and you try to save but the page just pops-out with saving, Check at the top for any pop-up blocks, a red dot will appear at the top click on it and allow pop-up, see screenshot :
Click allow all pop-ups and done once finished.
Save again and another pop-up screen will appear requesting you to save your work.