Image Display Differences Test to Live

[needainstall]

We have a local copy of our site that we use for testing and incorporating changes before transferring to our live site.

Today I noticed that all the thumbnails on our live site are now being stretched to fit 75x75px.

Image properties on the live site show, for example:
51px × 75px (scaled to 75px × 75px)

while the same image on our test server shows:
51px × 75px

Thinking it was an obscure configuration setting somewhere, I overwrote all configuration settings in mysql db on the live site with those from our test site. Problem still exists.

Does anyone know why one would scale the images and one would not.

Site has been active with zc for 2+ years and this problem just occurred within the past two days.

Could a new/different version of PHP be causing this??

Any help appreciated.

[mprough]

Probably a difference in the compiled image libraries in the separate environments/servers.

~Melanie