I sold 100% of my holdings in a security - the only thing that was in this particular account. There were only four transactions associated with this security, all of the names match, nothing seems weird. The cash resulting from the sale posted to Quicken, but it didn't relieve the shares. So now it looks like I still own the security and have equivalent value in cash.
Using Quicken Deluxe v 7.7.0
(Of course I can enter the adjustment manually, but it makes me worried about other transactions that might not post correctly in accounts where I own a dozen or more securities).