In the support section of Aerosoft forums, two recent messages hold interesting information to keep noted if you own the Airbus A318/A319 and/or A320/A321.
In case of issues while using their addon, it’s recommended to reinstall the complete product, following their advices, and to use also all Microsoft VC++ Redistributables 2005, 2008, 2010, 2012 and 2013.
The second post is about fixing the non connecting MCDU to a mobile device like an iPad.