I posted this problem before and the solution was "Try increasing the "Prepare Using nnn Millisecond Buffers" value from 250 to 500 or 750 in Preferences > MIDI > Playback and Recording".  I increased the Buffers to 750ms and that worked for 8th notes.  But now my 16th notes are skipping during playback.

How are you inserting the notes? By recording from a keyboard/controller or drum machine or mousing the notes in? If you're recording from a keyboard, ensure that the notes don't overlap.
Are you using a software synthesizer to hear the notes (which one) or a hardware device, such as a MIDI keyboard or sound module? Or are you using the computer's built-in MIDI device, the Microsoft GS Wavetable synth?
Describe how you work so we can get a better idea of what might be happening.
Welcome to the forum.
It's a good idea to put info in your signature at the bottom so we won't have to keep asking each time, info like operating system (32- or 64-bit), and audio interface/sound card, DAW software (I see it's MC 7).

I have Windows 10 (64-bit). I'm mousing the notes in.  I'm using the computer's built-in MIDI device (not sure how to find out what it is).  In Music Creator I selected Cakewalk TTS-1.

Go to [ Edit ] [ Preferences ] [ Audio ]  [ Driver Settings ] Where is reads "Mixing Latency" Change "Buffers in playback queue" to 8 and the slide control in "Buffer Size" toward "Fast"   Mine is set at 2.0 msec and it's good for 32nd notes.

make sure your ppq is set to 960.
 
To set the timebase for a project
1.
Go to Edit > Preferences > Project - Clock.

2.
Choose the timebase you want from the Ticks per Quarter Note list.

3.
Click OK.

None of these suggestions helped.  I set my Buffer Size all the way to Fast and 10msec is what I get.  My ppq was already set to 960.

What audio interface or sound card are you using?
What Driver Mode are you using?
What happens when you set the buffer size to it's slowest setting?

My sound card is built into my motherboard.  How do I find out, in Windows 10, which one I have?  Also, what is the Driver Mode?

if you're using your onboard soundcard, then that may be the problem.
 
my best advice is to get a better soundcard if you're wanting to get better performance.  but not a consumer card, a "recording soundcard" - usually they start around $100-$150 for the entry level.  check out the presonus USB and focusrite 2i2, those are probably the best entry level USB soundcards to start with.
 
in the meantime, in MC, hit"P" on your keyboard, that will bring up the preferences.  then go to AUDIO DRIVER SETTINGS
 
Change the driver mode to MME.  let Music creator run the tests.  then change the slider to the SLOW side, all the way.
 
here's a music creator article on soundcards and driver modes.  there's also a link to hardware for upgrades if you want more than just the 2 I gave you.
 
https://www.cakewalk.com/Documentation?product=Music%20Creator%207&language=3&help=Troubleshooting.19.html