This is a known issue with adding transparency to a page.
Thanks for the reply!
Because, I don't purposfully "use" transparency in my documents; Is there a way to disable transparency for an entire document without going through each image? (I want this difference to go away)
Trnasparency comes from multiple sources, andyou may not realize that you are using it.
Images and graphics often use transparent areas. That's a form that most users would recognize (and usually want -- do you want to see white boxes around things you place in front of a colored background?). Likewise, you can set an object to be transparent under the effects panel to allow something behind it to show through. But perhaps the largest source of transpaency is the use of blending modes and effects in ID which are not obviously transparency, drop shadows for example, or a glow.
You cannot globally turn off transparaency, nor can you make a transparent image non-transparent without editing and resaving it. You can avoid use of shadow, effects, blend modes and applied transparency within ID, though.
The "emboldening" of type is generally not a problem for high-end printing, but it can be annoying fro low resolution prints of on-screen display. The best you can do if you need transparency in your file, and you don't want to see any differnce between pages with and without, is to be sure there is transparency on all pages. Yo can do that by adding something to the master pages.
an easy way to avoid such problems is putting all text frames on a higher layer, this can be done manually or by script, I have put a script here for download. try it…
Sometimes that works, but mostly, I think, it does not do anything for the emboldened display. What it WILL do is help to prevent the outlining or rasterization of text when you print or export to PDF.