Published Captivate 6 project freezes on slide immediately before the first question slide

I am running both CP6 and CP7 on Windows 7.

I am still working on projects created with Captivate 6 in Captivate 6.  However, since installing CP7, any projects that I edit and publish with CP6 freeze up on the slide just before the first question slide.

Since I have only begun experiencing this issue since CP7 was installed, I am assuming that it is something to do with the fact that i have both versions (6 and 7) installed.

The only solution I have found so far is to open and publish the project in CP7, but this is not ideal as the projects I am working on in CP6 are new versions of ones already published in SAP LSO and I am concerned that publishing new versions of my courses from a different CP version will cause issues in LSO.

Any ideas why this might be happening?  Ideally, I would prefer to continue to use CP6 for existing projects and only use 7 for new projects.