(I realise this must be annoying you...)
On 1.4.5 in the Albums/Images tab I read "Click on the image to change the thumbnail cropping."
But the images ae not active. With 1.4.4 I could select the thumbnail and move the crop about, but not now. What controls this? Could not find anything in the forum about this feature.

If it matters I think I am using the default theme

Install the support build

This is running Firefox 22 on OpenSuSE, accessing a debian 7.1 apache web server

As my colleague said, please install the Zenphoto suport build or wait for the 1.4.5.1 bugfix release. The feature was broken unnoticed in 1.4.5.

Thank you; I did not find that in the documentation.