Problem system.DocumentsDirectory iOS iPad

Iam experiencing a strange problem. While saveing and loading from system.DocumentsDirectory works fine on iOS iPhone both in simulator and on device, I cant save a picture to system.DocumentsDirectory on iPad.
Has anyone else experienced this Problem?

code snippets:
par.fn = ‘gaul’…encodeFN(par)…os.time(’*t’))…system.getTimer()…’.jpg’
local view = display.captureBounds( cbound), par.fn)

As already described above the Problem seems to be the saving. It works on iPhone but not on iPad…

Ok I solved the problem thanks to the solar2D api reference. Even though the code was the same, the coordinates used for display.captureBounds were outside the screen on iPad…