It wasn't a complete lockup for me, but it did take a heck of a long time to "Remove Segment" and "Add a Course Point" in the 1.04 version. The browser (both IE6 and Firefox) would freeze. If I waited about 3-4 minutes, I could actually complete the operation. It was still slow when they flipped to V1.05c, but I could actually get by. For whatever reason, I've always found it faster to redraw than edit the route anyway. Anyway, let me re-test v1.06.

The computer's configuration is:
Windows XP Pro SP2, Firefox 3.5.7, Adobe flash 10.

If you really want me to give you a good test, post a link to a route that's giving you fits. Let's see if the map data has got something to do with it.