Deploy fails telling me the user don''t have permissions, but the user listed isn''t me!

I'm trying to deploy a project that I deployed yesterday just fine, but today I get the following error:

Deploy started: Project: Point Reports, Configuration: Debug

Deploying to http://reporting.companyname.com/reportserver

Deploying data source '/Data Sources/Srv24.FieldResponse2_1'.

The permissions granted to user 'DOMAIN\harley.p.bartman' are insufficient for performing this operation.

Deploy complete -- 1 errors, 0 warnings

This seems like a basic permission issue, except I'm not logged in as the user listed! I've never logged into my computer as the user. I did log in to the reporting services website yesterday as that user, but since have rebooted my machine and logged into bothe my computer and the reporting services website as me. Yesterday this report deployed fine. Today, this error message. I've even tried creating a new project and just creating a simple datasource and deploying just that, but still this message! Where is Visual Studio storing and reusing this user name during my deploy process?

It seems to me that it is storing those credentials in your datasource for the report.

Open your datasource for your report and check the credentials tab. Is "use a specific username and password" checked? If so, you might want to change that.

|||Everything is set to Windows Credentials (Integrated Security) on the datasource. At this point I can create a new project from scratch and when I try to deploy is still tries to do so under this other user's name. Obviously his name must be cached somewhere but I can't find how to clear it or to get Visual Studio to recognize that I'm me! I've tried clearing all my IE cache, but no luck.

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I've seen something like this in another thread, but I can't seem to dig it up. I think it has something to do with credentials in IIS.

Right click report server and reports in IIS and click properties. On the directory security tab, click edit under anonymous access. What is checked on this screen?

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Enable anonymous access is NOT checked. The only checked box in the Authentication Methods window is "Integrated Windows authentication". True for both Reports and ReportServer websites.