This has happened to be also - across 3 blogs!!! Happened in the first 5 mins of using Google+ with no "Are You Sure"
explanation that it was removing the images from my blogs. I still have most of the images and spent most of yesterday painstakingly re-editing posts to import each picture again. And we all know how long that takes. I think it will take weeks and weeks of work to restore - when surely Google have the power to "Restore to an earlier date"??
Tried to contact Google through the suggestions panel - Has anyone got any sense out of Google on this?