Q:

Chromium menus not rendered properly in Lubuntu 16.04

Have an old computer at home on which I installed lubuntu 16.04 after some recommendation from people in this forum Extremly Slow Dell Optiplex to recap, the system is: 

Dell Optiplex 270 
Pentium 4 at 3 GHz [32 bit] 
2 GB RAM 
250 GB SSD [newly installed, Toshiba THNSN256GBST] 
NVIDIA P118 FX 5200.

The system has worked impressively well with lubuntu right out of the box.  There have been just a couple of issues that I would like to fix.  Here is one.
As you can see in the attached screen capture, the menus on Chromium are not rendering properly (black boxes only).  The current window decoration theme is Mikachu and the Widget (Custom Look and Feel) is Clearlooks but the same happened with the default theme window decoration theme as well as Adwaita for Widget.  Whether I maximise the window or I keep it half size, the issue is the same.
The issue persists whether I use hardware acceleration or not (option within Chromium).
Note that the horizontal and vertical scroll bars have suffered the same fate.

A:

A workaround could be to turn off hardware acceleration in the browser. To do so, go to advanced settings (near the bottom of the page) in Chromium's chrome://settings and turn off "Use hardware acceleration when available". 

