I was really happy when i found this plugin. But when i am trying to use the Bulk Smush.it i get a white screen after 20 to 30 seconds. When i look in the library i see ERROR: posting to Smush.it and Did not Smush.it due to previous errors. I have also tried to smush the images in the library. But also in that case i get no positive result. I already deactivated the W3TotalCache.