Gram 6 Purchased With Platnium Wont Accept Mods

[Stragis]

When ever I place mods in my Gram (currently 6) and press apply, it takes me back to the arsenal screen. When I return to 'upgrade' my gram there are no mods applied. 

 

I've tried relogging, and 'remove all'.

 

Any suggestions?

[Dtexas]

Equip mods, and without looking back, go and run a mission. Then check the upgrade screen to see if they saved.

 

I had the same issue with my sweeper sentinel gun. Doing a mission seemed to fix it.

[Stragis]

This bug appears to have been related to having multiple arsenal windodws open. Perhaps this could be moved to UI bugs?