Since the 1.3 update, I have noticed the following problems:

Mission achievements not registered when in multiball mode when hitting shark target. (Two balls hit the target at the same time.)

Mission achievements not registered when lighting three lights to the left of the ramp entrance. (Also noted in "Ramp Boost Lights" thread.)

When lighting three lights to the left of the ramp entrance, the message "Stream Power" is displayed. I believe this was correct when this provided a ramp boost, but shouldn't this message have been moved along with the switch between these lights and the ones above the whirlpool?

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I would like to congratulate the developers on a well coded feature. While in multiball mode, I actually completed three missions in a stage. I thought that a third ball might appear for completing the stage. Indeed it DID ... when I lost one of the original two balls ... the other ball appeared as my delayed reward! Well done! (Of course, three balls at once would have been an interesting and fun outcome, as well.)
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This has been fixed in the 1.4 update. - Thanks