Users began reporting failures in active choice controls after upgrading from Active Choice 2.6.5 to 2.7. The issue was with the second level script with dynamic lookup. Example.

Static Lookup

First Dynamic

second dynamic

The first look up was failing. We found that if we toggled the sandbox checkbox in the "error" portion of the script that the script would function again until the next run. It did not mater what the default value was it appeared to be the change in the value that mattered.