Can't open ACSM-files anymore

My book store send me an acsm-file but Digital Editions can't open it and crashes everytime I try to open it. Normal epub-files work just fine but acsm-files are impossible to open. Maybe it's the latest update? I don't know...

I already tried to delete the former authorization and authorize again. Also I tried re-installing the program and installing earlier versions of Digital editions. Nothing has worked so far.