I have heard that when domain ownership changes, the domain loses its page rank.
My theory on this is: Lots of sites selling high PR domains actually cheat. They invest in high PR links for the domain they want to sell (say buy a yahoo directory link, or maybe even use their own set of high PR pages to link to that domain temporarily). As soon as someone buys the "high PR" domain, they delete those links. And the new owner effectively gets a '0 page rank' site. This might have led to the misconception that changing owners makes the domain lose its PR. But I may be wrong.
Can someone share their insights on this? Do you think it is safe for me to change registrar without affecting my SEO and current page rank at all? (Note that changing registrars can be as good as changing owners if privacy protection is enabled - as complete whois info will change). Anyone with prior experience where changing registrars has or has not affected their SEO?