It would help if we knew what you were trying to do and what your settings are. It sounds like you are new.
The default settings for the Render Cue are to only render the work area. That's probably it but we don't know unless we know your settings.
My settings are
Render Settings:Best Settings
Proxy Use-Use No Proxies
solo switches-current settings
guide layers-all off
color depth-current settings
disk cache-read only
frame blending-on for checked layers
frame rate-use comp's frame rate 59.94
motion blur-only for checked layers
end-1 minute 25 seconds
And what footages are used? What effects? At which point does the redner stop? Details, details, details...