This whole "problem" has already been resolved!

For anyone who still has an issue with how it works (and it seems to be a really small minority), sslechta discovered the option to sort by post start date, tommyad verified it works and I provided an easy to use link you can set in your browser as a shortcut so you never have to change the setting manually!

1) Copy the link below or go to it by clicking it.
http://www.pgmusic.com/forums/ubbthreads.php?ubb=postlist&Board=50&page=1&sort=start

2) Once there set that as a new shortcut in your browser.

3) Now, every time you wish to view the showcase in the order of latest post first (ignoring those "bumpy" commented posts), just click your new shortcut. It should stay sorted as long as you stay on the showcase thread.

4) And when you wish to view the forum sections normally just click around as usual.