IB-broker-Error-validating-request-Invalid-side-field-was-entered

Thanks for posting. For now, it looks like there's something wrong with placing short trades through the API. We'll call that a bug and work on it.

And just in case it isn't obvious because the update procedure has changed for extensions since WL6, you'd need to check Help > About in WL7 tomorrow or this webpage and download Build 4:
https://www.wealth-lab.com/extension/detail/InteractiveBrokers#changeLog

Build 4 is ready with the fix for Shorting.