There is a known issue that may impact any Microsoft Dynamics GP clients running Mekorma MICR.
We recommend that you contact Endeavour Support to address this issue for you. Support
In the late spring 2017 Microsoft included an update to .Net 4.7 in the Windows 10 Creators update that has been rolling out to Windows 10 users. This same update is now part of a Windows 7 update that is also beginning to be rolled out.
The update causes various issues with Mekorma including messages about security not being correct and errors when exiting GP. The issues prevent users from printing cheques. Mekorma security cannot be altered to work around the issue. (It isn’t really a security issue anyway, just a false message.) A Mekorma code update must be installed. GP databases will also need to be updated.
The following code packaged are from https://www.mekorma.com/support/downloads.aspx