It sounds like you have not allocated any group quick keys for the groups that contain talkgroups. They must be both allocated and enabled. This is a very common mistake; so much so a question in the DMA FAQ in our wiki is devoted to it.
In FreeScan, at the group level, use the 'quick key' pulldown (or use the 'find free' button to its right) to assign a quick key for that group. Do this for every group in the system. Then when you are done doing that to every group in your system, go to the system level and make sure those keys are checked in the 'TGID Group Quick Key Enable/Disable' area. Uncheck those group quick keys that are unused (no sense having them allocated when there's no groups to use them) . Of course, I'm assuming here that you have a system quick key allocated and enabled, and that you can hear the CC well.
If this doesn't work out, let us know what system you are trying to hear. Go to the database (top blue toolbar) and supply the URL. Take your FreeScan file and zip(compress) it, then attach it so we can all take a look. Sometimes this is the easiest way to determine the problem.
You can also check with other users in your state forum to see if a new CC or CCs are being used. If so have the database updated, then update your trunked frequencies at the site screen. It's certainly a possibility 73 Mike