Casio produces many different Waveceptor models, but the following tips should apply to most of them.
1. If you are located in the continental United States, then ensure that you have specified the correct time zone. You may be asked to select a home time city--LAX (Los Angeles) for Pacific time, DEN (Denver) for Mountain time, CHI (Chicago) for Central time, or NYC (New York) for Eastern time. If you have any other home time city selected, then synchronization will be disabled.
2. If the time is one hour behind, and you are observing Daylight Saving Time (DST), then be sure that DST is enabled in the watch. Some watches have only two settings ("On" and "Off"), while others have three settings ("On", "Off", and "Auto"). If your watch has three settings, then choose "Auto" (which turns on DST while it is in effect, and turns off DST when not in effect), otherwise choose "On".
3. Verify that the watch is actually set to receive the time signal. It is often possible for the user to disable signal reception (usually done to conserve battery power). If that was done, then you need to enable signal reception again.
These are general tips, not geared toward any particular model. For detailed information on checking or adjusting these settings on a specific watch, please consult that watch's manual.
You may also want to refer to the information found on the NIST Web site: