Windows R53.16 build 27.1.53.16
New Security dialog: Typing "ET" shows only the base LP stock symbol. Typing "ET-" shows a list of (apparently) various preferred suffixes. Select "ET-D" and click next.
Add Security to Quicken dialog: Make no changes and click "Done". Note "Add to Watch List is checked.
Result: Watch list does not show "ET-D" and I cannot use it when entering a buy.
???