Invalid proof of work (Stretch)

Hi there. I started Arduino and got a crash in gtk-qt-engine (splash.png-gtk-tqt-application). I just tried to upload a crash report but the upload failed with this message: Your crash report failed to upload! Please check your network settings and try again. The server responded: Invalid proof of work This server requires a SHA1 difficulty of 14 to accept anonymous crash reports I'm using the preliminary stable build on Stretch. Regards, Philip Ashmore