Well, something does not sound right.
I replaced the old pd4ml_tl.jar with the new pd4ml_tl_demo.jar. I also updated the pd4ml.tld

When I tested my simple test, this time too, the screen was blank and no errors. I also tested the index.jsp that came with the download and even that was showing 2 blank pages.

Am I missing something? or the Websphere 8.x on Eclipse some how is not making this work?