On Windows, after editing the hull_mods CSV file in certain editors, the game will no longer load, instead giving the following error: "Fatal: Error loading [ ship almost always recoverable if lost.] resource, not found in [../starfarer/res,CLASSPATH]."
If you are having this issue, open the hull_mods file in a text editor, and put quotations around the short description of Reinforced Bulkheads: "Increases hull integrity; ship almost always recoverable if lost." (The semicolon will likely have been replaced with a comma, but you don't need to revert it.) This should fix the error and allow the game to load.
I believe this error is caused because, unlike the descriptions with commas, the Reinforced Bulkheads short description does not have quotations around it, and many CSV/spreadsheet editors will turn the semicolon into a separator by default. This converts it to a comma upon saving, pushing " ship almost always recoverable if lost." into the column for sprites. This is a very minor fix, but patching it in the next update will make modding the game just that much more approachable.
I have not seen this error on Mac OS, and I have not tested it on Linux.
Cheers!