Possible bug found (Issuu & multisite)

I think I have possibly found a bug unless it is site specific. In a multisite setup, with all sites using the same domain and plugin settings.

If I enable Issuu scripts and iFrame it works fine on the main site. But on one of the sub-sites an Issuu embed never displays and always shows “this content has been blocked…” even though all cookies have been accepted. I noticed that the embed does load but the “this content has been blocked…” message gets displayed over the top of it. I have got around it by ticking ” disable content not allowed message” and then the embed can be seen.