We also had people unable to see our forms when using ad blockers so we switched the embed code on our WordPress pages so that they load from the LP domain (and we switched to SSL in Marketo).
I know this fixed the issue when people are using Ghostery, yet we are still getting some complaints from people who can't see our forms. Recently a person said he couldn't see either our contact us form or our unsubscribe form.
Any idea why these pages are not showing the forms to everyone?
See the advanced technique I mentioned to Mike here: https://nation.marketo.com/thread/51882-mktoforms2-is-not-defined-in-marketo-forms-2-cross-domain-re...