This seems to be an issue related to your specific application. Would it be possible to provide us access to the tested page so that we could reproduce the issue in our source code debugging environment? If this would not be suitable I would like to ask you to capture Fiddler
trace against the problem page and provide it along with the script itself. We have about 75% success rate using Fiddler trace to simulate your web server and reproduce the faulty behavior.
Here is what you need to do to get this trace.
1) Start Fiddler - note no browser should be open
2) Click Clear Cache
3) If your site uses HTTPS click Decrypt HTTPS traffic
4) Start Capture
5) Launch a browser
6) Navigate to the problem page and pop up.
7) Stop Capture
8) Save Capture
9) Put the .SAZ file into a .zip file and attach that to this support ticket
Thanks in advance for the cooperation. I hope to hear from you soon.
Telerik by Progress