i am hard to believe i check some site have problem with page rank display and show no page rank and no backlink this is some i know and check www.listedirectory.com www.directorypm.com www.wave-directory.com is it google make update or what?
you add this directories link on other websites or not because it shows kinks of internal pages only so you should place directories link on other websites
Now Google update this sites and again this sites get good page rank and also get more backlinks recently. Great.
yes google crawl every month and take time to visit again on it. so wait will update the position again with their visit.
Dear, i check your dir and its has pr6 & 3 and first is not open, so i hope you have more that recently pr that why you are sayong like that, actually dude recently previous day google update and many site, blogs and directories lost his pr, so don't worry next time it may be more than recent PR...