ADE 4.5.2 crashes while copying a ebook to Pocketbook Lux 2

Hi,

everytime I try to copy a ebook (*.epub) to my PocketBook Touch Lux 2 the programms stopps in the copying-screen. The progress bar is still moving but nothing is happening (longest I waited was 30min). The cancel (German: "Abbrechen") button is not working and I have to exit ADE with the task manager.

The same problme occures with the PocketBoot Touch and the Touch Lux 3.

ADE Version: 4.5.2.151207