I am getting a "The Stub file named "<...xxx...> is not valid" error.

This warning appears in some of our late builds as result of loss of connection to the SQL server. Please confirm the issue is intermittent or consistent when printing a Mekorma MICR Test Layout form. Then determine if the issue is intermittent or consistent in production. If the former or unable to reproduce this will confirm a temporary loss of data connection is the issue as Mekorma formats are stored in Mekorma SQL tables currently. We have reproduced the issue in-house when a data severance is induced.

Also, this error occurred in older Mekorma versions when clients upgraded from a build that supports the .stb format to a build that only supports the .stbx format, you posted a payment that used a .stb format and you are trying to view it in the newer build using the GP Inquiry. This issue is fixed beginning with Version 2010 B300 and 2013 B100.