Opening *new* document instead of cache-saved document

Hi, this is my first post here.

I'm new in using Acrobat Pro, and I have a problem while opening pdf files.

If I save from Illustrator  a new file with same name of previous versions, Acrobat will open the previous version instead of the new one.

To open the new one, I have to quit Acrobat (cmd-Q) then reopen.

I think that's a cache-raleted isuue, but I didn't find any preference about.

Thanx!