I have 2 sites which recently got PR 1 and 2 and today I tried to add one of my sites(pr2) to the links category of other site and they said they only add pr2 or more sites so I check and I saw my site is now 0 PR. I checked the other site and its also PR0. Is google changing something in its database or what? I dont think its possible 2 sites to lose PR so fast. Are they doing updates?
Many people have experienced this within the last few weeks you should focus on building some high quality backlinks and your pr will improve as your site ages.
It may come back to normal shortly. The other people on this forum with this same issue are noticing the PR jumping back and forth. One possibility is that you are just getting the PR from a different data center.