You shouldn't be worried at all. It's normal behaviour of this tool. A zero means that the tool simply couldn't receive your page rank value from that particular source.
But U must know, that this tool doesn't really predict your future page rank. It's not a crystal ball. The 'future' in its name refers to 'the next few days' during an update time and only during that time!! As we are mid-way between PR updates right now, the tool is pretty much useless <_<
So forget about this tool till mid Januray. If one day your toolbar shows 0 for your website then it may mean the update has begun. Use this tool then and maybe it will tell you (or maybe not) if your PR has improved or not...
|