I recently updated to version 1.3 and ever since I have been unable to “Safety remove hardware and eject media” for any usb flash drive or external hard drive after plugging it in. (Windows 7 32 bit). It always says device is busy.
After a lot of testing, searching, etc. I discovered it is related with SanDisk 1.3. After uninstalling version 1.3 I am now able to click on lower right of screen and remove usb devices normally.