64-bit ASP.NET MVC App won't run

First of all, I've previously managed to get one of my 64-bit test web apps to run on this machine (back when I was prototyping for this project). I've been working for a few weeks in 32 bit and realized I need to switch the app over to 64-bit and when I did (Set target platform to x64 in the project) and redeployed, it stopped running. It took me several days to get 64-bit working last time and I'm not sure what I'm missing this time that I did last time. I am publishing to and debugging under IIS. I get a BadImageFormatException with the message: "Could not load file or assembly 'GEMS.Web' or one of its dependencies. An attempt was made to load a program with an incorrect format." This app references both 64-bit and 32-bit assemblies. I have set "Enable 32-bit Applications" to true in the application pool in IIS. I'm using VS.NET 2012, IIS 7.5, running on a 64-bit Win 7 machine. The following is from the assembly load trace: ``` Assembly manager loaded from: C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll Running under executable C:\Windows\SysWOW64\inetsrv\w3wp.exe --- A detailed error log follows. === Pre-bind state information === LOG: User = XXXXXX\xxxxxx LOG: DisplayName = GEMS.Web (Partial) WRN: Partial binding information was supplied for an assembly: WRN: Assembly Name: GEMS.Web | Domain ID: 2 WRN: A partial bind occurs when only part of the assembly display name is provided. WRN: This might result in the binder loading an incorrect assembly. WRN: It is recommended to provide a fully specified textual identity for the assembly, WRN: that consists of the simple name, version, culture, and public key token. WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information and common solutions to this issue. LOG: Appbase = file:///c:/inetpub/wwwroot/GEMS.Web/ LOG: Initial PrivatePath = c:\inetpub\wwwroot\GEMS.Web\bin Calling assembly : (Unknown). === LOG: This bind starts in default load context. LOG: Using application configuration file: c:\inetpub\wwwroot\GEMS.Web\web.config LOG: Using host configuration file: C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet.config LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files/gems.web/eea5792e/72317e39/GEMS.Web.DLL. LOG: Attempting download of new URL file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/Temporary ASP.NET Files/gems.web/eea5792e/72317e39/GEMS.Web/GEMS.Web.DLL. LOG: Attempting download of new URL file:///c:/inetpub/wwwroot/GEMS.Web/bin/GEMS.Web.DLL. ERR: Failed to complete setup of assembly (hr = 0x8007000b). Probing terminated. ```