BATTLETECH - Game stuck when leaving "orbiting" screen

[Fraggenheim]

One line summary of your issue
Game stuck when leaving "orbiting" screen

Please explain your issue is in as much detail as possible.
Post-mission (randomg Planetary Government Mission), having returned to the "orbiting" screen I can let time pass but whenever trying to access a sub-menu (e.g. mechbay or contracts) the screen dims a little and then the game gets stuck. Music keeps playing but after 5 minutes nothing happens. Rebooting the whole computer does not help.

Steps to reproduce the issue
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[Fraggenheim]

After reading some other bug reports, I decided to test simply by logging in to the game and selecting the "manage" option to manage my profile; trying to modify my heraldry simply loads the customization UI wireworks but no pictures or 3d model appear ==> the game is stuck with music playing in the background.

So it seems like this is indeed connected to the fact that I did customize my heraldry option (changed the colors) during the last session the game actually worked, after that I am unable to open any UI pages where the customization pieces might be referred.