I have this funny problem. I have a combo box within the gridview. I realised that the combo box will not work if I scroll the page down. ALL the combo box will not work.
However, if I am on the top of the page OR if I zoom out so that ALL the controls are within 1 page. The combo box will be working fine. This is only affecting Chrome.
I have also tried to upgrade the AJAX to the latest version 2018.1.117