I open LRTimelapse then navigate to the folder (previously imported into Lightroom) then press Initialize, Key Frames then xmp Save.

I go to Lightroom 4 and sometimes keyframes are marked and sometimes they are not. How do I get the keyframes to show up? Thanks!

Hi Nikki,
please make sure to be always in Grid Mode (G), clear all filters, then have selected all (Ctrl-A) images before you read Metadata from Files.
best
Gunther