We found that checkbox column was not bool type and handled another way. After changing column type as bool. It started working as expected.

Glad to hear the good news.

Should you need further assistance or run into any problems regarding our controls, feel free to post it into our forum. We would be happy to assist you again.

Please find the sample in the attachment. I have added the required assembly files in the Bin folder.

Please feel free to let me know if you have different result.

I modified SaveAndLoadContentToFile.aspx sample file of WebTextEditor and load provided sample content by invoking LoadContentFromFile(string fileName, bool isCompleteHTML) method in button click event. Save the changes and view the page in Chrome 51 with CPU Profiling started.

I checked on the regex function in WebTextEditor_Helper.js in WebTextEditorConvertEngine.ConvertToXHTML, and found that it took 254.2 ms. I enclosed the CPU Profile (as attachment) for your reference.

The test was performed on: WebTextEditor 3 (3.0.1000.18); WebUI.NET Framework 3.0 (3.0.5000.975); and Chrome 51.

Please feel free to let me know if you find anything that I might miss during my attempt to reproduce the reported problem.

Try to do the following and let us know the result:

1. Add following meta tag in the header of the page.
   

   <meta http-equiv="X-UA-Compatible" content="IE=edge"/>

2. Update WebUI.NET Framework 3.0 to the latest (3.0.5000.975).
3. Add following style to the page which has WebGrid inside.
   

   <style>    div.WG5-F div table
       {
           width: 100%;
       }
   
       .WG5-Header
       {
           box-sizing: border-box;
       }
   </style>

I created a simple sample based on your scenario (EnableCompatibilityView_Sample.zip in the attachment). Please evaluate the sample on your end and let me know if the problem still persist.

Hope this help.

Then.. today.. I actually was able to isolate the issue to a much larger degree. It occurred to me that all company Macs have regional settings "Norwegian". I tried changing to USA and English. And suddenly all ClientUI pages worked!

Thank you for the detail information. I'm currently check the report and will get back to you as soon as possible.