Blank IFRAMEs on square plugin for zen cart

Plugin was working fine and now the IFRAMEs that capture details are blank . the source page is blank page , on the check out page where text input is supposed to be is blank IFRAMEs

Are there any clues that may have been logged to the console?

Hey there! Zen Cart’s plugin is developed and managed by their team, so I recommend reaching out to Zen Cart directly for assistance with this. Unfortunately it isn’t something Square or Square API developers are likely going to be able to fix.