Bug graphic of last visits on july 4th

Today (july 5th), the graphic of last visits indicates 0 visits on July 4th. Yesterday, everything was ok, and I had about 400 or 500 visits on July 4th.

In search engines or external websites, for the day of july 4th, I have results (see attached screenshots). It seems there is a bug in graphic of last visits.

php version?

PHP 5.3.5

This was also reported in the german forum: here[/url] and [url=http://forum.piwik.org/read.php?2,78544,78566]here;

I also have the problem (PHP 5.2.6). (See Screenshot). Unfortunately I have no time atm to investigate the issue. I filed a new bug at dev.piwik.org

~Peter