Did you import a new cert into MWG or was it generated on the MWG (self-signed)? Can you send a screenshot of the cert and its properties? Example;:
I'm asking because there are a couple of issues it could be.
1) You went to a CA, got a web server certificate and imported it into MWG -- this is bad because the MWG needs a CA cert, not a web server cert <- this would happen in IE too
2) If you generated it on MWG, depending on the version, it could be SHA1, Chrome does not like that. For versions 7.7 and higher, we use SHA2 for the cert generated in the UI