We actually tried a StartSSL certificate, but got OCSP errors with (at least) Firefox. We'll retry the certificate in the (very) near future, maybe it just takes a while for the OCSP information to trickle through after creating a cert.
If I remember correctly, with StartSSL you have to wait for up to 24 hours before the OCSP servers are updated. I ran into the same issue with my last certificate from them, just have some patience :)
