WxPython: RESIZE_BORDER not working?

Question

Python

The situation is as follows. I have two Ubuntu 14.04.2 LTS, one at home (installed instead of Debian), one at work (installed from scratch). There is a python script using wxPython: the main window is created (wx.DEFAULT_FRAME_STYLE | wx.STAY_ON_TOP), then the child window (wx.RESIZE_BORDER).
At home: everything works as it should - the child window has no decoration, but is resized. At work: a child window without a title is not resized (via the menu item on Alt+RMB - it is still resized), with a title (wx.CAPTION) - is resized. 
CHADNT? Is it a matter of libs or system settings?