Play store opens, but no Downloads: Please help!!

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http://forums.androidcentral.com – I have a Samsung Galaxy S3 with Android 4.1.2 and I am experiencing the following with Google Playstore: The Play store opens... I select the app... It prompts me to "Accept & download"... It says "App will be downloaded and installed",... if I press "back button" it shows the app page and says "Downloading" with bar (as it would be an app waiting to download),... but there is no progress. It's as if it is stuck... doesn't want to download. It also does the same when I try to Update my existing apps. The last time I was able to download a (HowTos)