Mail crashes if "open in adobe reader" is clicked on quicklook

Question

mail crashes if "open in adobe reader" is clicked on quicklook

Answer 1

You don't need any third party app at all in order to view a supported file in the mail app. It should be viewable even without Adobe Reader.
You do see a paper clip icon to indicate that there is an attachment but you don't see the opened PDF or the PDF icon in the body of the email? Did you swipe all the way down to the bottom of the screen? Is this just happening in one email or does it happen everywhere in the mail app?
Quit the mail app completely and restart the iPad. Go to the home screen first by tapping the home button. Double tap the home button and the task bar will appear with all of your recent/open apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus sign in the upper left corner of the mail app icon. Tap the home button or anywhere above the task bar. Launch mail again and see if the PDF opens or appears. If it doesn't, close mail again and restart the iPad and then try again.
Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.