ID 253418 - Animating a Multiply node with channels set to 'all' causes Nuke to hang

Problem summary
Animating a Multiply node with channels set to 'all' causes Nuke to hang

Customer reported version
nuke.n/a

Customer reported platform

Steps to reproduce
1. Open Nuke
2. Open customer file (attached)
3. Reconnect customer footage (available in link provided in comments)
4. View the last node (Keymix)
5. Scrub through the viewer and switch between frames/attempt to play clip. Do this until the refresh icon in the top right of the viewer stays red
6. Once refresh icon is red attempt to play sequence
Result: Viewer will hang and stay on the same frame
7. Disable the 'Multiply7' node 
Result: the viewer stops hanging and starts playing as expected

Workaround
Unknown. 

Reproduced by support
OSX 10.11.3:
Nuke 10.5v1
Nuke 10.0v5
Nuke 9.0v8
Nuke 8.0v6

Windows 8:
Nuke 10.5v1

Expected behaviour
For viewer to play sequence without issues

Actual behaviour
Viewer would not refresh and would hang