Hi Steve,
While I release an update with the latest version of the GradientDomain module, here are two workarounds that will allow you to save your project:
- Uninstall the GradientDomain module. Right-click on PI's workspace and select Manage Modules. Double click the GradientDomain module item to turn the green checkmark into a red crossmark and click Done. Restart PI and the module will be uninstalled.
- When you save your project, uncheck the 'Include interface states' option (Project Generation section). This will allow you to save a project with images, icons, histories, etc. *except* the states of all process interfaces (usually a minor problem).
Hope this helps. I'll try to release the update real soon.