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Everything seemed cool.
I recently noticed googlebot had been to my site. Cool, I thought.
Then I noticed that one, and only one, of my pages had a white bar (PR0) on the tool bar.
Mmmmm. What’s this? I checked and double-checked the page in question. All looked okay.
I researched webmasterworld for related posts and came to the conclusion that I should just wait until the next update to see what happens.
Then by chance I was on the PR0 page again and I noticed a period (.) that was hidden text. I don't think it even had to do with my hidden text penalty issue -- somehow, ever since I built the page, there must have been a period the same color as the background.
I don't know if this is the cause for the PR0 or not. But GG did mention that their hidden-text police bot would come to check periodically to make sure cleaned sites stayed clean. Maybe I got dinged for a single hidden character.
If you’re in a similar situation, you may want do a very careful review of your pages.
Good luck.