I opened 2 separate hi res pdfs (the front and back of a postcard) in illustrator 5.1. The type on both sides had been outlined and we just relinked the background image on both sides after we did some color adjustments to it. The only type on the front was the name of the company and the headline. Both were white type in separate magenta bars. The type was centered both horizontally and vertically in each bar.
When I opened the front, the headline text moved from being centered horizontally on the pdf to EXACTLY flush right with the company name. There were no problems with the text moving on the back side.
We have been receving files from this client for several years and always make color adjustments due to the uncoated paper stock we print on and have never encountered this before. The original files that the supplied pdfs were made from were also created in illustrator 5.
Is this a known issue? If not, is it acrobat or illustrator problem.
Sounds more like the structure of the original AI is in such a way, that items become unanchored. Sometimes this happens when you accidentally move stuff between groups and AI does not reset transform information. May also be a specific appearance on the object that has not been properly expanded and thus results in wrong calculation of placment of the bounding boxes which in turn makes it embed oddly in the PDF...
Is there any way for us to prevent this from occuring again?
Or should we request the native illustrator files with the fonts outlined instead of hi res pdfs when we know we have to alter/relink images placed in the artwork?
Could this problem with the type moving also have occured if the pdf was opened in illustrator CS6?
Was the original PDF created in Illustrator? To find out, open the PDF in Acrobat and go to File> Properties, it should show you what program created the PDF. Illustrator is not a universal PDF editor. A safer work flow would be to use Edit Object in Acrobat to make your color corrections. If you decide to use Illustrator, go to Select> All text objects, I suspect there are some un-outlined and un-embedded type elements.
If the fonts are properly embedded, there is almost no reason to outline the type.