I apologize if this has already been covered, but doing some quick searches I couldn't find the problem that I'm having.
I use a modified version of the Trident Theme (renamed RawLightning) on my blog (www.boltsmag.com) and I've found that if I click on a Category or a month with many posts on it -- the navigation that displays at the bottom of the content window only leads to "Sorry, no posts match your criteria" messages. This limits the amount of posts that show up per month / per category for someone just browsing around the site (and I've run into the problem several times when trying to find an old post I did from time to time).
I'd do away with the navigation structure if I can be sure more than X number of posts per month show up on the monthly / category archives.
Any help is appreciated (and again, I apologize if this has already been addressed in this forum).