When the inventory group is full no items of those types can be picked up. The fourth tab is the inventory for other crafting materials, and the fifth tab is your food inventory.
The second tab is the inventory for natural blocks, and the third tab is the inventory for crafted blocks.
Steam Workshop is integrated into the game and mods can be built using the Lua scripting language used by games such as Roblox and World of Warcraft. I changed the byte from 04 to 05, saved the file, and was able to change fem4. I opened the file with a hex editor and found exactly that. Since fem18 is 5 characters long and fem4 is 4, it was crashing.
As a result, lots of mods for the PC edition of the game. So, I realized that there was a byte somewhere that wasn't showing up in Notepad++, telling the launcher exactly how many characters to expect.
I'll post very thorough instructions on finding the player file, selecting the correct one, BACKING IT UP just in-case, getting the data to me, and activating the changes on your end whenn I'm done, easily. So, I'm posting this to see what kind of interest there is for someone like me to offer their services to the community to make requested edits to your character. There are some mods and programs out there to do that, but I've found it very easy to do simply by editing the. There is no way within Starbound to re-make your current chartacter without having to redo your missions and stuff.