Doesn’t happen for me on Xubuntu.
My guess is that it is specific the AwesomeWM. Have you tried with a different WM? Is Audacity OK on AwesomeWM other than the splash screen?

Which version of WxWidgets, built against which version of gtk?

I don’t think Audacity 2.2.2 was tested with WxWidgets 3.0.4, though I wouldn’t expect major problems. It’s supposed to be built against Wx 3.0.2 (with gtk2 - gtk3 is known to cause major problems). The next version of Audacity should be built against Wx 3.1.1 and gtk2.