ROOT 6.20/02 no longer correctly renders histograms with custom bins and custom error bars, on a canvas with a logarithmic horizontal axis. With ROOT 6.18/04, both attached test cases work as expected, rendering the histogram. However, with ROOT 6.20/02, testcase3.C fails, in that the histogram is not visible on the canvas, while the axes are drawn as expected. Two additional things to note: (1) the rendering issue not only affects the GUI, but also exporting to PDF; (2) the histogram appears to still exist on the canvas. By moving the mouse over the canvas, I can see the cursor change, and I can right click the histogram.
The histogram appears in 6.20/02 after switching the horizontal axis to linear.
Apologies for the long testcase. It was created by exporting an existing data histogram.
I am not sure with which gcc version my ROOT 6.18/04 installation was built.