Clip speed/duration not working properly in project panel/bins

Using percentages in Speed/Duration is the only way to get really predictable results in my experience. You all may have a lot more experience day to day with this than me, totally understood.

But from my experience and "experience" here, and from engineer's comments, percentage is really the more solid way to get speed changes to simply work.

In the end, I'm all about the practical. What works ... works.

Yea I've tried that workflow as well but as Neil says, it creates problems in weird places. I find playback on speedramping in the timeline is wacky and inaccurate until rendering for example, jogging quickly through source clips also doesn't always behave properly, etc.

Interesting.  To clarify, I'm describing how I use it for, let's say, a 24p show that has slow-motion footage shot at 60p that is meant to only ever be used slowed to 24.  When I need to make add'l changes to speed, or I have, let's say a show where I'm using high-frame-rate material both at its original speed and a slower speed, I'll leave it interpreted at the original speed and just make speed changes where I want them.  

Yeah the proxy thing is really irksome.  I'm still not sure I understand why the proxy workflow can't just treat the proxy exactly the same way it treats the oiginal clips, when it comes to interpration, etc.  But I know that's another thread.  🙂

Interpret Footage was ... according to engineers ... designed for cadence changes. It is not the process recommended for nearly all standard time changes. It has issues with everything from creating proxies on.

They recommend the Speed/Duration process, as the OP used, for most speed changes.

And this has been discussed here and elsewhere many times.

I've not encountered this bug – in fact this is the first time I've learned you can actually apply speed changes in the bin – learn something new every day!  But generally for the conform workflow you're describing, I would propose that the superior process (and the one I use all the time) is to interpret the footage at the preferred frame rate before editing.  To do so, you select (or batch select) the 60p clips in the bin, right-click and select Modify > Interpret Footage, and change the frame rate from the file's default to 23.98 or 24 or whatever rate you need.  This avoids a lot of the quirks and skipped frames that occasionally crop up using speed changes.