Checking the name of a javascript snippet in a button’s properties results in the snippet name being cleared from the field without notice.

Go to the button’s Actions properties.
Click the Run Snippet action.
Click the arrow in the snippet name combo box. USE CASE: This is done to verify that the correct snippet, with misspelling, has been entered as the action property.
Click outside the Run Snippet action, e.g., to the “Actions” header above it; anywhere such that the Run Snippet properties dialog no longer appears.
Go back to the Run Snippet properties dialog and observe that the snippet name is blank! Had you not gone back to the dialog, you would not know that the snippet was no longer being called!