A site that has been up for a week is all of the sudden not displaying individual entry pages. No code is being output at all on those pages. Turning on debugging shows that EE is running through the template, which appears to be doing everything just fine.
The output of the template for quick viewing is on Dropbox.
The site in question is: http://momsintow.com
The particular issue is with any of the individual activity pages: http://momsintow.com/activities/stroller_fitness_class1
Any help is greatly appreciated.
Edit: also worth mentioning, the SAEF edit entry pages are not working either. My guess is they are related since they both require an individual entry.