Disclaimer

This will work for stores on Miva Version 9.07.00 - 9.07.03.Note that this will require making template changes. Make sure you make sure you are aware of what version was active before any changes are made. These edits are low-risk but if you feel uncomfortable with making these changes then we advise you to seek help from a developer. 

Issue

At the moment all existing (pre 9.07.00) customfield checkboxes are returning 'yes' until you cahnge their state.

After they are re-activated they will return 1. You may have a mixture of 'yes' and 1 for the same product.

Examples:

<mvt:if expr="g.my_customfield_checkbox_var EQ 'yes'"> <---- WRONG

<mvt:if expr="g.my_customfield_checkbox_var NE 'yes'"> <---- WRONG

<mvt:if expr="NOT ISNULL g.my_customfield_checkbox_var"> <---- CORRECT matches yes and 1

<mvt:if expr="ISNULL g.my_customfield_checkbox_var"> <---- CORRECT matches an empty field or not assigned variable