Sharepoint 2013 - Which Server Should Run Microsoft SharePoint Foundation Sandboxed Code Service

We have just deployed Sharepoint 2013 and also CRM 2011..
Our Sharepoint 2013 Environment has a WFE and an APP server and we have a CRM 2011 box.
We have been getting the following error in IE when Users in CRM are clicking on the Document Link under accounts which links to Sharepoint 2013
"This Content cannot be displayed in a frame
To help protect the security of information you enter into this website, the publisher of this content does not allow it to be displayed in a frame."
It seems like it is a IE Security Issue, but I am suspecting it could be the Microsoft SharePoint Foundation Sandboxed Code Service.
Which server should be running the Microsoft SharePoint Foundation Sandboxed Code Service| WFE or APP.
Also which server should run the Windows Service: SharePoint User Code Host
Thank you in advance.

Hi,
Please have a look at the following post:
http://technet.microsoft.com/en-us/library/jj219591.aspx
As it describes, the recommendation is for both services to start it on the Web Front End servers.
Cheers,
Vincent

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