Symptoms
After upgrading to 4.6.9, it is no longer possible to copy-and-paste from List Views. It is not possible to even highlight values in List Views.
Diagnoses
This behavior change is by design. The reason for this change was to accommodate the 'Allow Multiple Row Selection' option in the list. The users can now hold CTRL and select one row, or as many rows as they would like by using the mouse to click on a row or multiple rows. The user can also hold CTRL A to select all rows. Previously, before 4.6.9, when the user would hit CTRL A or CTRL clicking on a specific row all of the text on the form (CTRL A) or the text in the cell clicked (CTRL clicking on a row) would be selected.
Resolution
The behavior changed to accommodate the ability to select multiple rows in a list view. In addition, a feature request has been logged to make it still somehow possible to copy/paste list view data.