The icon bounced once
You have a Mac?
The app was working perfectly yesterday
The program has stopped working without any update? Maybe it's a problem with your coollection file...https://www.coollector.com/help.html#coollection
Can you find the coollection file and rename it from "MyCoollection.cool" to "MyCoollection.cool.bak". If after that the program opens, then it's a coollection file problem and you'll mail me "MyCoollection.cool.bak" so I can test it. If the program still doesn't launch, you can remove ".bak" from the coollection file name.
My email is hector at coollector dot com