I've always found Dropbox a bit buggy, but it's gotten worse since I updated to IOS 7  When I download zip files or webpages &amp open the files, the screen is blank, blackened or a blurred enlarged image of the symbol (of Facebook, Google or other symbols related to the site that the the zip file or webpages it came from 

As a teacher, I rely on having access online &amp off line related to research  for work my work as a teacher  Also, I am required to write notes &amp save them as zip files in order to save space

So, please fix Dropbox! Why does it keep telling me that I can't open some documents &amp that I don't have the authorization to alter or edit my document on the flip side, some documents tell me to enter a password (???)

If anyone has any suggestions to improve this or recommends a different program to recommend, I would appreciate it

Thanks!