Render Elements are saved as black frames
Note: this article is in the "Obsolete" category because we have not received any reports about this issue for a long time. If you have experienced this recently, please contact us!
Sometimes (usually when using distributed rendering) render elements save as solid black frames. It is not yet clear why this happens, and currently the only known solution is removing all of the elements from the list, and then re-adding them anew.
Another idea is making sure that no objects belonging to other renders are used in the scene (e.g. Vray camera).