This bug is still alive in krpano-1.0.8.11, it is crawling over my screen as well. 
The problematic behavior can be reproduced with the following code:
<krpano onstart="myinit">
<plugin name="test"
url="myimage.jpg"
x="10"
y="10"
width="prop"
height="50%"
align="lefttop"
edge="lefttop"
/>
<action name="myinit">
trace("plugin[test].x=", get(plugin[test].x) );
plugin[test].changeorigin( lefttop, righttop );
trace("plugin[test].x=", get(plugin[test].x) );
</action>
</krpano>Replace the url with that one for an existing image.
Normally, x should get a bigger value after changeorigin(), but it does not, instead the whole image shifts to the left.
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