Use the following instructions to Clear Cookies and Cache (Safari Browser) for the iPad.
(NOTE: Safari could running in the background even after you close it. See the tip on Closing Background Apps)
-Exit all instances of Safari you have running
-Click on “Settings” (This will vary depending upon how you have your icons set up).
-Click “Safari” in the Settings column on the left side.
-Click “Clear Cookies.”
-Confirm by clicking “Clear.”
-Repeat with “Clear History” and “Clear Cache.”
Other Tech Tips
Closing Applications Running in the background (links for iPhone or iPod but are the same principle for the iPad)