Here's the scenario: Adrienne and I have the same access grants and belong to the same security groups. When she tries to approve a proposal to become a project she gets an override error. When I approve the proposal to become a project it works as expected - no errors. Any ideas why she would get an error and I don't???
I am not sure which version you are using, but we had a problem when using 7.1 that sounds similar to what you are experiencing. The user that was listed as the project manager could not open the project. We ended up having to grant the "View All Projects" access grant to our "Project Manager" security group. If you were not listed as the project manager for the project, you could open the project. Not sure if when you create the project from the proposal you are not listed as the project manager, but maybe when your co-worker creates the project from proposal they are listed as the project manager.