Still images rendering

It is possible to render still images with Blender as long as you have properly set the scene parameters before the archive creation.
For the moment, it is not possible to select afterward the frame number you want to render. You have to render a minimum of 2 frames or rebuild the VUB archive if you have made mistake.

In the Scene properties (Output Properties), in the section Post Processing, please uncheck Compositing.
Still images are rendered in multi-band, it meants that the image is cut in multiple slices rendered in parallel on several render node of the farm, then stitched back together at the end of the process.
To avoid any discontinuity between two slices the compositing must be disabled.