When I try to open the VBA editor in the zenOn editor, nothing happens
Perhaps VBA is disabled (zenon6.ini [VBA] EIN=1)

or the project is a CE project (project properties, general, "CE Project",

or important references are not set correctly (FM20.dll) Try to create in zenOn a new project, open the VBA editor and check the Microsoft Forms 2.0

or in very rare cases, e.g. due to a powershutdown on the engineering PC, the project vba file is corrupted. In this case, please send a backup of your project to your local zenOn support agency.