Dispatcher configuration problem - Calling GetProcAddress on ISAPI filter "C:\inetpub\Scripts\disp_iis.dll" failed
I have spent the past week trying to sort out a problem with a new configuration of a Dispatcher installation. It is running on IIS 7.0, on a stand-alone server in our Development tier, so it has full access to our single Author and Publisher servers. I have gone through the Configuration page (http://dev.day.com/docs/en/cq/current/deploying/dispatcher/disp_config.html) and the Troubleshooting page (http://helpx.adobe.com/experience-manager/using/dispatcher-faq.html) several times. I have verified that my IIS server has the dispatcher files (the newest ones for 64 bit server) installed in c:\inetpub\Scripts and that they have been edited following the instructions (the dispatcher.any and disp_iis.ini files). The modules have been registered in ISAPI Filters, Handler Mappings, and Configuration editor, and the json mime type has been added. I have triple checked everything. I have even built a temporary server with the Author, Publisher, and IIS server all on one, just to make sure it wasn't an external firewall issue. On the temporary server, I am running the Geometrixx demo site and I can see the pages just fine in the Author mode (http://localhost:4502/content/geometrixx.html) and Publish mode. But when I try to pull it up on Webserver mode (http://localhost/content/geometrixx.html), I get the following error:
Calling GetProcAddress on ISAPI filter "C:\inetpub\Scripts\disp_iis.dll" failed
The only post I see about this refers to registering the disp_iss.dll file, which I have done - and I checked again to make sure.
The only difference I can see is that the documentation talks about a disp_iss.pdb file but that wasn't in the downloaded .zip file (nor in the SSL or x86 versions either). Is that old documentation, or do I need to get that file from somewhere? Or is there another issue at the root of this? I am pulling my hair out, and I have a deadline for a demo site this week. Any help would be appreciated.
Diana W.