Updating apps issue (3/26/2015): verified work-around
If you have the issue where the App Store on your iOS device is displaying an OPEN button rather than an UPDATE button, here is the current work-around. Thanks go to "jguchte2" from the following topic https://discussions.apple.com/thread/6593179?start=15&tstart=0
jguchte2 wrote:
"Force-close the App Store app
Open the App Store app
The app starts at the tab "Featured"
Now comes the tricky part: press the "Updates" tab and immediately the "Update All" button. Apps should now be updating."
In addition, I myself have found the following...you need to let at least one app update completely for the issue to clear. If you have multiple devices, you need to do the same procedure for each device. Clearing it on one device has NO effect on other devices you may have, despite logging out/logging back in to your App Store account.
iPad Air 2-OTHER, iOS 8.1.3, 16 GB