Hi,
Sorry, i did not read you question properly ( tired from work i guess
)
the script is probably
i have not worked yet wit a mouse orbit script but
maybe you can try disabling the script when tweening and enable again when done?
To try this Drag the script (on your camera) into a state before the tween and click set property,
then select the enabled property
if that does not work can you attach a sample scene or the mouse orbit script?