Hi Everyone,

We have a very strange problem at the moment whereby our Silverlight 4 
application will not 
display the contents of ComboBox on (some) client machines.

We have an observable collection in our view model, with a simple binding 
expression on the 
ItemsSource on the ComboBox. In the page's Loaded event, we are calling a 
domain service to 
retrieve the items, then in it's Completed event we are storing the returned 
items into the 
collection. Nothing fancy.

Firstly, when we deployed the solution in Release mode, the combobox's had no 
values. I opened 
fiddler and saw the request and response from the domain service, and it was in 
fact successfully 
returning the correct data to the client. However the combobox's had no data in 
them.

I rebuilt in Debug|Any CPU configuration, hit the same URL and it worked 
straight away - the 
combobox's were filled with data. Problem solved? Not quite.

We then gave the URL to someone else to test (on the same network/subnet) and 
the combobox s 
were empty again. It works on 5 machines, and doesn't work on the rest. I 
checked fiddler, and 
the response is coming back with all the data - Silverlight just doesn't 
populate the comboboxes.

We have tried a number of things - IE no addons, chrome incognito's, cross 
domain and client 
access policies... nothing seems to make a difference. We've tried running the 
browsers as 
administrator, we've even tried on very old machine running IE6, same issue (ie 
no UAC or 
anything strange there). No anti-virus installed on any of the machines. At a 
complete loss. We've 
tried machines on the company domain, and off the domain with no difference - 
different operating 
systems (xp/win7).

Does anyone have any ideas or solutions for me on this problem? Seems like 
there's something 
installed on the machine doing it?

Cheers,

Matt (via Tony's email)


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