"F8" mode works fine, aside from the "dialog obscures devices and cannot be repositioned" issue I've mentioned previously. See attached view of F8 mode working properly. However, thereis one interesting thing to note: The circular bars are colored properly, showing reachability I'm guessing. But there's no hop count number shown. Perhaps the rendering was changed since the screenshot Chris posted earlier.
"Shift-F8", however, doesn't do anything for me. Neither does right-click followed by "View Signal Strength". You can't see it in these screen shots, but the cursor has changed. It's a normal arrow with a small circle to the right and below it. The circle is solid black with a white outline. Clicking on devices has no effect. Just in case it's a "target box is mispositioned" kind of issue, I've clicked all over the map. No effect.
The about dialog reports Version 2.1 (Build 2)