The only way this can be marked as not exportable on a new certificate is if the 'Advanced Private Key Options… ’ when you applied was unticked for ‘Exportable?’.
I suggest submitting a ticket at http://support.comodo.com
And ask for the certificate you are using to be revoked so that you can re-apply.
When you get to the page where you complete your details, click on 'Advanced Private Key Options… ’ and make sure the ‘Exportable?’ option is ticked.
Yeah the not marking the Private Key As Exportable is totally counter intuitive especially considering that the instructions for backing up the Key assume a non-default option thats hard to find and requires forum digging.
[quote author=kulaworld link=topic=12878.msg149708#msg149708 date=1207444745]
could you be a bit more specific about where or how I get to the “Advanced Private Key Options”?
I had a problem with this issue too until I observed the following. When applying for a certificate using Internet Explorer, there is a request to allow the Active-X Control “Certificate Enrollment Control”. When it installs, a link for Advanced Private Key Options appears immediately above the section for the Revocation Password. Clicking on the link opens a form with options for CSP, Key Size, Exportable, and User Protected. When Firefox is used with the default rendering engine, there is only an option for key size. Using the IE engine in Firefox for the same page gets the advanced options link.