What VST(s) are you using to produce your sound? SoftSynth? Garritan? NotePerformer?

I just upgraded to 26.3.1.520, and I'm having this problem as well.  Did you find a solution?

UPDATE:  I used the Play button once before using the spacebar playback, and that seems to have remedied it.  Spacebar playback has worked each time after that.  I restarted Finale and tried this sequence again, and it worked.  The green line in spacebar playback lags until I use the play button once.

Too many potential causes; not enough information to begin guessing. Adrian asked an important question but no one is answering. Otherwise…

https://makemusic.zendesk.com/hc/en-us/community/posts/215729367-General-Discussion-House-Rules 

I apologize for the wait, life got crazy. Jeremy's solution worked! Thank you all so much for the help, and kudos to Jeremy!!!

Jeremy's update above DOES actually work! And that was posted a year ago. You'd think MakeMusic could have figure this bug out by now.  8-/

What bug? No one has been complaining about this in 27 that I’ve noticed. Not happening on my Mac.

@Mike, it’s with Windows 10 I believe. I just upgraded to the newest Finale hoping it would be fixed, but the issue persists. The workaround still works, so it’s only a minor annoyance.

I agree with Mike H. I have WIn 10 and 27.2, had 26.3, and I do not see the issue and I have never seen it.  I do know that it does happen on some machines but that causes me to believe it is machine specific and not a Finale problem or bug.  The only reason I say this is so you guys don't spend time looking and checking in the wrong places.

I know the guys that do see it, the space bar trick seems to fix it. I suggest you never use the space bar for playback and use the midi triangle play button. Perhaps that is why I never saw it on my machine? I never use the space bar.