MiKTeX and proTeXt ⇒ pdftex-def loaded or not?

[mfiligree]

When I try to compile my text, one of the error messages is that pdftex-def is not loaded (for my epstopdf package), but it is! I double checked it, and it was installed a few days ago. I did it myself, so it's possible I didn't do it properly, but why isn't my document reading it if it shows as installed? Newfile seems to be the same way. (I recently upgraded from version 2.5 - any relationship?)