After the last "upgrade", my Galaxy S4 no longer connects with my Windows 7 computer. Prior to the upgrade I would plug in the phone via USB, and in Windows Explorer I would see SCH-1545 and all of the files on my phone and SD card. Now when I plug it in, I see SCH-1545, but when I click on it there are no files showing. Has anyone else seen this; and, more importantly, come up with a cure?