Thanks for your reply.
I started out with a p12 cert, but the Wi-EM required a private key as a separate file. I can't just upload one file that contains the private cert within it. So I went looking for other formats I might try...
When I try to submit the p12 cert with pvk private cert I get "Certificate upload failed: Wrong password or unrecognized certificate file format".
I get the farthest with the p7b/pvk combo, but like I said it just takes me to a blank page.
Any other ideas?
Thanks!