Many thanks, Ian,
I gave the new Plug-in a good try-out with each type of WavPack file I have: 4.3x core stereo and mono, 4.40 beta core stereo and optimized mono.
I've had no problems thusfar. In fact, your new native plug-in has one functional advantage over the WinAmp plug-in, in that it displays the bitrate of the files correctly, which the WinAmp plug-in for some reason, does not.
As someone new to the forum, and as a foobar user who's testing out XMPlay as an alternative, I really appreciate the prompt responses to my query on this issue. Since WavPack is my lossless codec of choice, I consider full support of it to be a necessary feature of ANY player.