Blocks do not appear in my custom theme.

I've been searching the Context Module issues board, and though there seem to be slightly similar issues, I'm fairly certain that this isn't a duplicate. I apologize if it is.

First off, I'm a Drupal user, and (since I'm learning) a non-contributer. I'm not sure if I fully understand the theming system, but I'm doing my best to learn it! I don't believe this is a theming error, which is why I'm posting. Any help is appreciated.

I'm not using a theme framework, since they all seem fairly bloated to me, so I've written the theme in question from scratch (a theme.info file, a standard page.tpl.php, stylesheets), following the guidelines on the Drupal.org theming write-ups.

I don't have a template.php, and therefor, am running off of all of the Drupal defaults, with the exception of my own region definitions in the theme.info, and page.tpl.php, which have been declared correctly.

My question is:

Do I need to add any code to template.php to make Context Module control my blocks? It works fine in Garland, but not in my (extremely) bare-bones theme.