2.92 rendering strangely

Hi! Newbie to blender. Recently completed a materials test that I was happy with using 2.91.

Then I installed 2.92 and wanted to re-render the same image as a square with a little more wiggle room around the main objects to use as my avatar for this forum and the render has turned to crap! I tried to figure out what might have caused this, but to no avail. I finally reloaded my original blender file and did a straight re-render and it is still coming out crappy.

Anyone know what might be causing this?

Thanks!

Using a 2008 Mac Pro with an ATI Radeon 5770 GPU. I’ve only got 4 GB of ram at the moment, but if lack of memory were the issue, I doubt my first render would have turned out as well as it did.