Apparently the method doesn't work for checkboxes?

Apparently the method doesn't work for checkboxes? I tried the link you generated above in the checkbox section but the form showed up blank.

Multiple checkboxes in a group cannot be prepopulated as the name is similar and this causes conflicts in prepopulation, you can only prepopulate using only one value at a time i.e

http://form.jotformpro.com/form/52254399730965?test=Option 2 (this option will work)

http://form.jotformpro.com/form/52254399730965?test=Option 2 & test=Option 3 (this will fail)