You were right, sorry. I tested it on my laptop that I use on my commute and it is normally lagging a bit behind. I have just tested and I don't get errors on going to that tab as a player, but I do get them when trying to add an item (right click) add item:
[2/22/2024 9:30:20 AM] RULESET: Mongoose Traveller (2E) ruleset (2024-1-3) for Fantasy Grounds
Copyright 2023 Smiteworks USA, LLC
[2/22/2024 9:30:20 AM] RULESET: Mongoose Traveller 2E
Copyright 2016 Mongoose Publishing.
[2/22/2024 9:30:20 AM] RULESET: Core RPG ruleset (2023-12-28) for Fantasy Grounds
Copyright 2023 Smiteworks USA, LLC
[2/22/2024 9:30:20 AM] MEASURE: LOAD - PART 2 - 6.0375562
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[2/22/2024 9:32:26 AM] [WARNING] Frame tabs contains out-of-range values in BottomLeft.
[2/22/2024 9:32:38 AM] [ERROR] Script execution error: [string "MGT2:..ign/scripts/spacecraft_cargolist.lua"]:44: createWindow: Unable to create window
Ideally players should be able to maintain the cargo list on the ship - as it is theirs. Was that ever the intention on the screen, would be an easy one to add?