SilverTime

That's what did it. Updating both Firespitter and Module Manager to the newest releases got things going again. With KSP being in steam and auto-updating, I didn't even notice the new version until you pointed it out. Thanks for all the help.

I just tried Installing Firespitter 7.6.0 posted 10 hours ago here: https://github.com/snjo/Firespitter/releases Still have the exact same issue.

I tried the suggested fix with Firespitter, with no result. I have reinstalled this mod repeatedly, with no result. I have added the patches, again no result. I have spent about three hours over the course of two days just trying to figure out where to get information on this mod from this form, and to be frank I am completely burnt by the whole process. I don't know what is wrong. I am not prepared to do surgery on this mod or my system to extract the necessary information and provide a step-by-step account of attempted fixes. The problem remains the same. The only lead I have at this point is problems with read-only settings. I found that the Steam appdata folders are set to read-only. For some reason the system is not allowing me to make these folders not read-only. This is what I have: KSP: 1.3.0.1804 Windows 64bit Problem: OTP components do not display fuel tank types or selection. No ability to adjust fuel tanks on all components Mods installed: Firespitter 7 . 3 . 6 2 1 2 . 3 6 3 3 1 Module Manager 2.7.6.0 Reproduction steps: Mutliple clean re-installs. Re-installs with patches included. Log: https://www.dropbox.com/s/b5vegukb9b63thf/output_log.txt?dl=0

I just reinstalled this mod and for some reason, there is no option to run many of the OPT components with fuel. There is no option there, at all. I get nothing when I right click, or for cargo bay modules the fuel tank options are not there. I can't figure out what is causing this. The parts I have confirmed this bug on are: Main Wing B Large Pylon J Fuel Tank J Bicoupler J Connector Variant