ID 271495 - Tracker - resizing/manipulating track point bounding box causes tracker window to stretch and intermittently crashes Nuke

Problem summary
Tracker - resizing/manipulating track point bounding box causes tracker window to stretch and intermittently crashes Nuke

Customer reported version
nuke.10.5v1

Customer reported platform
10.12

Steps to reproduce
1. Open Nuke
2. Create colorbars
3. Create tracker node
4. Add a track point
5. Move forward a few frames and move track point
6. Repeat step 5
7. Resize tracker point selection area
Result: tracker window stretches to the bottom of the viewer and the following message appears:
ERROR: Not all keyframes have sufficiently similar dimensions, ensure the keyframes being compared are all of roughly similar sizes.

Workaround
Unknown. 

Reproduced by support
Nuke 10.5v3 - OSX 10.11.6
Nuke 10.0v5 - Linux RHEL 6.3
Nuke 9.0v1 - OSX 10.11.6
Nuke 8.0v7 - OSX 10.11.6
Nuke 8.0v6 - OSX 10.11.6

Could only reproduce the crash once on:
Nuke 10.5v2 - OSX 10.11.6 
70CE3F28-D05B-42B8-B107-8E02CFC3279C

Expected behaviour
Tracker window to scale appropriately

Actual behaviour
tracker window stretched to the bottom of the viewer window