2.42a renders slower and differntly on same proj.

Folks, I am making some slight modifications to a logo I did with minimal camera moves. I notice that it used to render in a scanning fashion (top to bottom) and fairly quickly. Now the same project file loaded in 2.42a renders slower and in blocky chunks.

What’s caused this?

Mac OS 10.4.8 (PowerPC)
G5 Dual 2 GHz/ 4GB RAM

Render buckets were introduced in 2.4something. It is primarily aimed, I believe, at network and dual processor systems where the rendering process can be shared then combined.

You can turn it off using two text fields in the scene (F10) window - they are labelled Xparts and Yparts. Set both to 1.