Swisscex managed to solve issues with the wallet but also announced the deadline:
Dear customer,
We want to inform you that Graincoin will be removed from our systems. Please withdraw your Graincoins within the next 30 days.
Coin name: Graincoin (GRA)
Date of removal: 12.02.2015
Please note: The coins cannot be recovered after expiry of the 30-day grace period.
Best regards,
SWISSCEX Customer Services