SUMMARY
Icons for all toolbars missing upon loading application.

STEPS TO REPRODUCE
1. Run program

OBSERVED RESULT
Icons for all toolbars missing.

EXPECTED RESULT
Icons on toolbars.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: n/a
KDE Plasma Version: n/a
KDE Frameworks Version: n/a
Qt 5.12.4 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 9.2.1 20191008) on "xcb" 
OS: Ubuntu 19.10 [linux version 5.3.0-40-generic]


ADDITIONAL INFORMATION
Gnome 3.34

Just installed kdenlive for the first time from the PPA. Started playing with the program, but then I noticed the apparent lack of toolbars. Played with it, realized they're there, but just blank. Here's what the UI looks like:

https://i.imgur.com/tCLVY5N.png

Once I visited the Wikipedia page for the software, I realized all the tool icons are missing.

I checked to see if the Breeze icon package was installed, (as mentioned by the "Missing package" of the Troubleshooting page).

$ sudo apt install breeze-icon-theme
Reading package lists... Done
Building dependency tree       
Reading state information... Done
breeze-icon-theme is already the newest version (4:5.62.0-0ubuntu1).
breeze-icon-theme set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Attempted a reboot with no change to situation.

Also, because it gives me a different answer upon installation and the "about" page, I'm not entirely sure if I'm running 19.12.1 or 19.12.2.