Greetings from Belgium!

We're using CRM Dynamics (2013) on iPads but we are having issues with the close as won/lost buttons.

When using the 'close as won' button, the dialog pops up fine, we can fill it out, but on the second/confirmation page (see screenshot below) the 'finish' button does not work (and neither does the 'cancel' button).

We then have to close the CRM application itself and start it again.

When we return to the opportunity, it is set as won so there is no need to repeat any step.

What can we do to fix this? Are we the only ones having this issue?
Thank you in advance for helping me out :)