Symptoms
Latest update to Chrome means you are unable to configure some controls
Diagnoses
Since updating chrome to Version 50.0.2661.75 m (64-bit), you start to see problems when configuring drop-down lists or autocompletes with a SmartObject data source.
In Chrome, you cannot configure an item display anymore.
Resolution
A new update for Chrome was pushed out (Version 50.0.2661.87 m (64-bit)) which should resolve the issue.