Premiere Pro has been working fine... I just changed Preferences/Timeline to allow for a scrolling timeline on playback. After that, I started playback and observed the expected scrolling timeline... however, I cannot stop playback now. My last proj save is about 5 minutes ago... probably okay if I kill the process but would like to avoid that... it's a lengthy sequence so the alternative is to wait like an hour LoL 
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Note, I enabled scrolling playback because paging playback was not working... it is usually fine. I'm thinking my long sequence is the problem. I tend to see issues when I get into multi-hour sequences that I sometimes use for reviewing footage into a rough cut.
Any thoughts on how to interrupt this playback? I tried Control-Break but no dice... it appears the Premiere UI is stuck so looks like I won't be able to interrupt it with a UI control or space bar. 
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Jim_Simon wrote
I always select the No Scrolling option. Still get this bug, though. Kind of annoying.
that's a shocker... I never saw this issue until actually selecting that option one day out of curiosity. I did so and ended up playing a long timeline which had unsaved edits ... do I end the Premiere process (and lose edits) to continue work or wait an hour or more for the playback to finish. The edits weren't worth so I ended the process and lost them. Lesson learned, never go into Preferences and randomly try out an option that catches your curiosity while in the midst of an involved project/edit.
That you are see this with the default non-scrolling is odd... I didn't see it before selecting scrolling, haven't seen it since reverting it, wondering if you're seeing a slightly different thing (same symptoms but different under the hood).
I think tangential to this thread, but not sure...
What I have seen is this weird ugly huge perf storm hit my system which causes Premiere to slow to a stuttery crawl such that the transport bar is completely ignored, space bar doesn't do anything, and playback stutters until the performance storm passes. Not completely sure, but seems worse if I enter full screen (CTRL-~) during playback. It doesn't always happen... seems to be when AME is opened not doing anything but has something queued, and I'm scrubbing or playing the timeline back in a project. I even opened a smaller project and it was great but eventually saw the same thing so it's not characteristics of my larger project. Both projects use AE dyn link so I've wondered if there's some interaction between Pr and AE that is causing things to get gummed up. There's also apparently some audio stuff going on process-wise (from casual observations). The biggie potential clue... I don't think I saw this stuttering until I transcoded stuff to CineForm and imported it into these projects. I've seen suspicious that CineForm playback/decoding/processing in Pr can get gummed up somehow... but all of this is abstract info based on casual observation... I don't see big CPU peg when this "perf storm" occurs... Pr has some CPU with AE running, AME isn't doing much... there's an audio process doing something... so I was wondering if CineForm decoding had issues in it's audio processing making things slow down to appear "gummed up" due to (as one thought) software locks/releases and related timing. All superficial symptom reporting here... but i throw this out there in case anyone has seen this version of the "i can't stop playback right away" ... in this case, though, if I wait, the perf storm ends and i can stop playback. So I think this is not the same as the subject of this thread. 
However, it surprises me that the Premiere transport bar doesn't have some sort of built-in high priority thread or some such that can immediately abort playback using, if not Stop, some other key, or CTRL-BREAK or whatever. I feel a video editing app should never run wild due to a perf thing like this... I've already waited up to two minutes until my Stop command is handled... it's odd because I'd expect the transport commands to be honored with immediacy in all cases.
Jim_Simon wrote
I didn't see it before selecting scrolling
I never saw it before 2017.1.2. Happens a lot now.
Jim Simon can direct you to the bug form. 
Really though... sounds painful... those are the worst... I bet your auto-save is short and you save a lot. Hopefully it can get fixed. I have yet to see that with non-scrolling so it's odd to hear this, I'll keep an eye out. Maybe something in the hardware can contribute to a race condition or deadlock... perhaps if you have super fast or super slow hardware (I gather the former), it surfaces the bug more easily... that would explain one reason why I have yet to see it without scrolling.
The fix for me was 2 things. (For context: I edit on 3 4K screens on PC) and the problem seems to be cause by one of two things. It won't happen if I edit on only one screen PLUS I have to change my monitor settings to 100% scale. I'm referring to the "Change the size of text, apps and other items" line below. Normally I'd have it at 150% so the icons are not so small. I hope that helps!
My quick fix:
Edit on only one monitor
Edit at 100% monitor scale size (PC) - I'm referring to the "Change the size of text, apps and other items" line below.
Turn off smooth scroll (changed to page scroll)
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