MAPI Intergration with applications

Since the update from GW14 client to GW18, users can no longer send emails from Excel (2013/2016) and Sage. If we roll back to the GW14 client it works fine.

For some users it works, but they receive prompts to load the GW Profile (Which doesn't help if sage is trying to send 50 mails as the prompt appears 50 times) but for others there is just an error.

Do you know if there is any fix for this? Or even a workaround to get it working.