Ipad Dropbox app cannot open some pdf files

my Ipad Dropbox app cannot open some pdf files. The blue download bar appears and when download is complete, the wheel spins and spins and nothing happens.
Some files are password protected. until recently, the password window would open. Now it does not. The wheel just spins and spins and the file does not open.
AN email attachment (pdf) which I opened in Dropbox on my iPhone opens fine. Files saved in Dropbox from my desktop won't open. This is true for pdf and MSWord files.
I'm running iOS 7.1.2 (11D257)

Try a reset: Simultaneously hold down the Home and On buttons until the device shuts down. Ignore the off slider if it appears. Once shut down is complete, if it doesn't restart on it own, turn the device back on using the On button. In some cases it also helps to double click the Home button and close all apps BEFORE doing the reset.
Should that fail, you might delete and reinstall the app.

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RESOLVED
I found two suspect programs that were installed within the last 48-hrs that may have caused the problem
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This appears to have reduced the time to load a document. Thanks Jimb From: Anubha Goel <[email protected]>
To: jimb70395944 <[email protected]>
Sent: Friday, March 20, 2015 4:37 AM
Subject: You have been mentioned by Anubha Goel in Re: why does reader freeze while opening some pdf files and others open instantaneously? in Adobe Community
|
You have been mentioned
by Anubha Goel in Re: why does reader freeze while opening some pdf files and others open instantaneously? in Adobe Community - View Anubha Goel's reference to you Hey jimb70395944, Please try disabling protected mode under 'Edit> Preferences> Security (Enhanced)' and uncheck 'Enable Enhanced Security' option.Then, try again and let me know. Regards,Anubha
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I cannot open a pdf file with aole-mail. I can open pdf files from windows explorer. I have associated pdf with adobe reader. My operating system is window

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