Calling 'gPad->SetLogx(1)', either from a script or interactively by right-clicking the axis, after a TGraph is drawn causes loss of the x- and y-axis title (and formatting).
I believe this might be because the internal histogram in TGraph is recreated when SetLogx(1) is called? In this process it appears that the axis attributes are not correctly carried over.
Not sure when this problem appeared, but ROOT 6.10, 6.12 and 6.14 seem to be affected, while ROOT 5 is still OK. I didn't check other versions so far.
This macro demonstrates the problem