Mac OSX HighSierra Web Viewer issues

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Hi everyone,

A while ago I have developed a FileMaker solution that is currently running on FileMaker server Version 14.

I have 40 clients connecting to the server.

Every client is either version 14 for 15 a FileMaker Pro.

The solution includes a calendar which is displayed on the web viewer.

The calendar pulls real-time data from the FileMaker server and displays it as a web page inside webviewer.

The calendar uses PHP and CSS to generate the view.

Every client that has updated to Mac OS hi Sierra he's having issues with the web viewer.

Sometimes the  content loads immediately, but sometimes it takes a second reload in order to see the content.

Is anyone else having similar issues since upgrading to OS X hi Sierra?

Thank you

Federico