Сhange slides through black screen

Steps to reproduce:

1. Run test application
2. Press key 1
3. Press key 2

Expected result:
After step 2 Change slide with red rectangle without black screen
After step 3 Change slide with green rectangle without black screen

Actual result:
After step 2 Change slide with red rectangle - OK without black screen - NOK
After step 3 Change slide with green rectangle - OK without black screen - NOK

Test application in attachment