how would i check to see what other modules have changed?

It doesn't matter that a module might have changed, so long as the change was implemented correctly.
You can check for this specific problem by simply trying to "use" a module. In a script:

use MIME::Base64;
[download]

or from the command line:

perl -MMIME::Base64 -le 1
[download]

Cheers,
Rob