Thanks for reaching out and we're sorry you're encountering this error. We’ve escalated the issue to our developers for further review. Since this appears to be menu-related, it may be tied to a localization issue. We’ve seen a similar case before where the issue was resolved by uninstalling both Adobe InDesign and in5, then performing a clean reinstallation of both. After that, everything worked as expected.
I’ll follow up once I have more information. Once again, thank you!