Thanks for your reply, Dan. After several frustrating hours, and with enough research, I finally realized the key to my problem–my laptop needed to be rebooted. For some strange reason, the copy/paste buffer of windows wasn’t carrying over into AE, so whenever I tried pasting the Magpie keyframe data into the Time Remap layer, nothing would happen. I eventually came to this conclusion when I copied the keyframe data from AE and pasted it into Notepad successfully.
Anyway, I need to figure out why this happens from time-to-time. Until then, I hope this info is of use to anyone else experiencing the same anomaly.
-Robs