A little like Philip Marlow would have said:"I took a whiskey, that didn't help. I took another, that didn't help either". I had the automatic upgrade to 4.0, and that made it unopenable on my iPhone, I waited and then upgraded to 4.0.1 - that didn't help either.
I'm running an iPhone 3G (not the 3GS)) with IOS 4.2.1, an an old iBook G4 with IOS Leopard - meaning absolutely no iCloud, and PM Light, so my concern - when I read your description of PM 4.0 was: Do I really need an iCloud for running PM, is that the reason I can't open it and get to all my financial data.
Shall I just wait for the version 4.0.2, and then I can get to my financial data again and carry on? or do you rely so much on iCloud that I either have to buy a new iPhone or stop using PM Light?
Is there a way I can downgrade to the version before PM 4.0 (i.e. 3.1.9) ? Because I could live with that
By the way - thanks for a nice little app