PHP gd issues

[Paul Macdonald]

Hi,

Sometime within the last week an upgrade has left some php gd functions 
non working on my systems,

from imagecreatefrom png:      gd-png:  fatal libpng error: 
[00][00][00][00]: unknown critical chunk

I don't recall any updates which might have affected this and can;t see 
anything in ports/UPDATING.

A re-install of php5-extensions leaves in the same state...

Has anyone else seen this and any suggestions for a fix?

Is there a log of recently updated ports i can look at ( i stupidly 
don;t log this myself)

thanks
Paul.