I am following the holy grail tutorial for lrtimelapse 4.2. I get to the point when I am generating visual previews, but i still see very bad jumps on my pink line. I made sure to use the sync method when editing my keyframes and have had no problem there. Any ideas what i'm doing wrong?

It looks as if the holy grail wizard has not been applied at all.
Mostly this might be a problem with the DNG Converter not being the latest version - please install the latest version, link on the install page.
Check, if in the regular view (visual previews off) you can see the orange kurve for the Holy Grail corrections mirrored to the blue curve.

Make sure to not have added any gradients or removed gradients when editing!

I have updated to adobe dng converter 9.1 and will try running through the steps after work today.

That did it!