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We need much more information to speculate why this happened. But changing anything in a pdf file is not necessarily minor. We always recommend recreating the pdf file from original documents. Editing a pdf, can effect the embeding of the font used in the document. It may have been saved as a font subset, but now it may have to have the full font embedded. Never edit a pdf if it can be avoided.
Thanks Michael for the reply. Unfortunately, our end user MUST edit this PDF and many others on a regular basis. They are creating content within Acrobat.
What other information would be useful to diagnose this problem? How can I determine if the font is saved as a font subset? I am a network administrator, and not an Acrobat specialist or expert, but I can research and gather the necessary information.
I am having this exact same problem in our environment. We recently migrated from WinXP to Win7 and for the most part the problem went away, but one particular Acrobat X user is still having the problem.