cv2.imshow() not displaying text properly

Question

I am trying to display an image with cv2 in python:

import cv2
img = cv2.imread('Prova.jpg')
cv2.imshow('image', img)
cv2.waitKey(0)

the image looks good. But all the texts are not showing correctly:

1. RGB values in the status bar are squares
2. icons in tool bar are blank
3. right-click menu text are squares

See:

blank menu bar

and

right-click menu

Specs:

• Anaconda with python 3.5
• SSH connection to server: Putty + Xming
• opencv 3.4.2

Anybody could please help?

Edit:

a normal output would be something like this: