Hope you can help....

I have completed a crop and lens correction transform in Lightroom on all my time-lapse images before loading into LRTimelapse 3 but the corrections do not seem to remain when processed.

I have saved metadata as well as attempted to re-load photos and followed through the workflow from Initialize. However when saving XMP and returning to Lightroom the photos have reverted to what they were originally - without the crop and lens correction adjustments.

Am I missing something or does the software not allow for such steps?

Appreciate any assistance...thank you.

You should follow the workflow by first initializing in LRTimelapse and then editing the keyframes. Make sure to apply the lens corrections to all keyframes (you will do when copy/pasting settings from left to right like I explain in the tutorials!).
The same goes for the crop.
Check out the tutorials:
http://lrtimelapse.com/tutorial