I can confirm this bug is still happening in lucid after a resolution change. It seems that the panel changes it's settings after that. I usually fix it with the gconf-editor. There I set he position of all the applets in the right using the option "panel right stick". For example "faster user switch applet" should be in position 0 (in pixels) with panel right stick. That means that this applet would be always in the right, in every resolution. But when I change resolution and the applets move randomly I found that "faster user switch applet" is in position 884 without panel right stick (that means counting from left side). I don't know why it reconfigures itself every time the resolution is changed.
I can confirm this bug is still happening in lucid after a resolution change. It seems that the panel changes it's settings after that. I usually fix it with the gconf-editor. There I set he position of all the applets in the right using the option "panel right stick". For example "faster user switch applet" should be in position 0 (in pixels) with panel right stick. That means that this applet would be always in the right, in every resolution. But when I change resolution and the applets move randomly I found that "faster user switch applet" is in position 884 without panel right stick (that means counting from left side). I don't know why it reconfigures itself every time the resolution is changed.
PD. Sorry for my bad English