The issue seems to happen when any Telerik Silverlight control is loaded. This appears to be similar to the problem reported in another forum post because of the response below that alludes to there being issues with the Silverlight module in Safari 5.1:
"We are aware of that issue, it came with the latest version of Safari (5.1), which was released after release. It seems that in the latest version of Safari there is a huge issue with the Silverlight module, which is used by RadAsyncUpload. As a temporary solution I would suggest to disable Silverlight, until we find out what is going wrong." (http://www.telerik.com/community/forums/aspnet-ajax/async-upload/asyncupload-handler-exeption.aspx)
Both the Windows 7 and XP computers have Silverlight version 4.0.60531.0.
The Windows 7 error has the following details:
Problem Event Name: BEX
Application Name: WebKit2WebProcess.exe
Application Version: 75220.127.116.11
Application Timestamp: 4e056f84
Fault Module Name: unknown
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Offset: 7eaf5340
Exception Code: c0000005
Exception Data: 00000008
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
The Windows XP error has the following details:
First we get a Data Execution Prevention message with the following:
"To help protect your computer, Windows has closed this program.
Publisher: Apple Inc."
After closing that message we then get the following Windows exception:
EventType : BEX P1 : WebKit2WebProcess.exe P2 : 7518.104.22.168
P3 : 4e056f84 P4 : unknown P5 : 0.0.0.0 P6 : 00000000
P7 : 7fc85580 P8 : c0000005 P9 : 00000008
Please let me know if you need any additional information.