Borders and merged cells cannot be saved

Borders and merged cells cannot be saved

Dear Zoho docs Team

Since the recent maintenance I have the following problems:

1
Borders which I creat by clicking the border symbol do not save

2
Merged cells do not save

An example is 
https://docs.zoho.com/sheet/ropen.do?rid=9ukhkc97551d89b6043f8910b372c6b268164

Hopefully you can solve my problems!

Thanks and kind regards
Hans