Yes, if you do a future scenario instead of doing them in order, some funny bug will kick in and you won't be able to unlock other scenarios, and I'm afraid to say it, but I think you'll have to restart the scenarios. (I think that also includes re-installing the game. :
: ) All I did for the shark tank was just make it bigger using the windowed fence and adding extra water pumps. Never had problems with money.
For the pandas, don't go ahead and buy them first thing. Establish a good park at first by adopting the least expensive animal and then adopting the second most expensive and so on, while taking care of guests' needs. THEN, once you've raked in enough money, buy one panda at a time. Once you get enough money for another one, buy a second one, and then a third. They won't breed unless they're 100% happy. (Completely satisfied.)
Hope this helps.