I've found that the bug is fixed in versions later than MC 1.10.2 and FL alpha 0.0.3

Even the simplest of infinite pushers fail after the first few pushes, I looked at the NBT and it seems the cooldown gets set to -1 at some point and until that is fixed it just stops. Might be wrong, it's been a while since I had a good look at how it works.

• Mod Ver • 0.0.3 (MC 1.10.2)

One of many that I have tested; (I have it set to not require rf)

You do know pushers and sliders can't move themselves, right? You need more than one.

Yeah, of course...
The green pusher pushes the bottom right segment, and then the red puller pulls the top left segment.
That's what they should be doing, as far as I know.

Are you sure the frames aren't 'sticking' to the ends of the pushers and pullers?

Ok, so since it's been months since I posted this I decided to test it in an otherwise empty 1.12.2 instance (mod ver 1.1.0) and the design that I have in the picture works perfectly.
So I tested it in 1.11.2... also works perfectly. (mod ver alpha 0.0.1)
But then 1.10.2 (mod ver alpha 0.0.3)... runs through a couple cycles and stops.

I guess that makes the bug a little redundant, since it's fixed in later versions, but I'll just edit it into the OP.