Which Telerik controls do you use in your web site? So far you are the only one user which reports such a problem with our controls and the problem could be related to your code.
The "The process was terminated due to stack overflow" error could appear if there is an infinite function calling loop. I searched in Google and found the following forum threads which could be helpful for your to debug and find the reason for the problem:
How to debug: w3wp.exe process was terminated due to a stack overflow (works on one machine but not another),
w3wp crashing out,
w3p.exe terminated due to stack overflow - how to track down the issue?
debugging error — error attaching to w3wp.exe
The process was terminated due to stack overflow
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