SW2004, SP2.1 This is one that one of our guys feels is an issue, although we can't repeat it consistently.
When you put in balloons, you now have the option to pick the attachment point and then place the balloon. When you do stacked balloons, the proceedure is the same, except you keep going and select more objects. What he found he was doing, was when he was zoomed in enough that the initial balloon position didn't show, rather than his second click positioning the balloon, he was actually selecting the next object. The after a few times of doing that, he would crash.
I have used stacked balloons many times, but always positioned the first one before continuing, I guess mostly out of habit and I have never noticed an issue with them. I also tried to repeat his scenario, and only crashed once, whereas he crashed several times today until he changed his methods. Since I can't repeat this one at will, the best I can do is ask that people keep it in mind and see if there is any correllation out there.
WT