I just wanted to let all my non-USA users know that TaskCard will crash if you attempt to set the activation key in the preferences if you are using anything other than an USA English keyboard layout. Thanks to a user who reported the bug and identified the problem himself.
I will get this fixed soon and release a bug fix update but for users of on the Mac App Store this may take some time as Apple is slow to approve updates (one reason to buy direct from developers instead of the App Store). Until then change the keyboard layout before typing anything in the field and you’ll be fine.
Sorry for the hassle!