That's strange, when I click accept in the invitation this message is shown: "Sorry, this project invitation has now expired."
You sent the invitation to me at 2am and I've opened at 9am... Please check with DesignCrowd because I don't think its normal or even fair to both parts.

Thank you and hope I can show you my design.

Hi Simon,
I spoke with Design Crowd and they sent you an invite and reopened my project.

Hi, already sent my proposition
hope you love it
Simon