Mountainamster, it appears I have found a small bug...
it seems that I see this error more consistantly when I have more than 3 custom saves... though on one machine I can have 3 saves but when I add the fourth I see the errror... on my main pc, I get the error every time... I've tested a bunch of different scenarios and don't have an exact answer on when it happens unfortunately...
Basically I created 5 saves, one for each shade of background... I've created the new save, hit the apply button, created another, saved and applied... etc... chose 'cycle custom settings, chose 1 minute for testing purposes... it doesn't cycle after a minute, then when I escape the aquarium, the message is there...
Just wanted to let you know,
riz