thanks for the link I've tried 1.3.1 and the app starts fine, it connects to dropbox without any problems and I can even open my encrypted folder.
I can also click a file, it will be downloaded and encrytped and after that the corresponding app is being launched - adobe reader for example - but then the problems start: The app can not find the decrypted file.
This means at the moment boxcryptor is completely useless on Blackberry but I guess that it will be very simple to fix this bug as it is most probably just a path that is not set correctly.
I encourage you to check out the Blackberry playbook with its Playbook OS 2.0/2.1 as the the next minor version of this OS will become Blackberry OS 10 and will run on all new mobiles from Blackberry. It is based on the real time operating system QNX, features a solid hardware and a real good os and well it bringt an android emulator that integrates apps in the normal menu.
This will become the 4th larges mobiles os-platform besides iOS, Android, Windows phone 8 when Blackberry moves their new devices to this OS.
It would be cool if you could make your boxcryptor app run on Blackberry!
For developers it is really easy to convert their Android Apps!