Here is a helpful method for ascertaining that one is keyframing an entire clip or still--with no missing frames at either the beginning or the end of the clip/still:
--with the CTI between the beginning and the end of the clip/still that you wish to keyframe, click Page Up to move the CTI to the very beginning of the clip
-- right-click on the clip/still, select Properties and then select the desired keyframe icon
--after verifying that small white dots have formed under the CTI that is in the keyframe area, click Page Down to bring the CTI to the beginning of the next clip
--click the Left Arrow key, which will move the CTI exactly one frame backwards=just inside the clip that you wish to keyframe
--complete your intended keyframe operation, click Done and
--Voila! you have keyframed precisely one clip/still, from its very first to its very last frame