um, no idea, im not doing anything with the help system, the only thing i added recently was a new itab ui for the resource console, its just a basic tab that draws a billstack with some custom bills, do you get any actual errors?

ah thanks for having a look, the funny thing is that i don't remember seeing any unusual errors,
(its possible that some errors initially were suppressed when i had lots of mods enabled, as the newer version of rimworld that recently got released, mentions warnings for every mod about the new syntax for specifying what version the mod supports)

just that when Rimefeller was enabled, the whole helptab tab was empty, and i went through lots of trials and errors to remove different mods or change some ordering, but it only worked once rimefeller was removed. the only error that i remember seeing a couple of times, was a debug error to do with an oil field, but i think i saved 1 error that kept making 1000 log entries about an oil barrel 1 sec i try and get to upload for you...

here is a screenshot for you:
https://steamuserimages-a.akamaihd.net/ugc/942844711414139969/BD808EE29BC8A570C0B18C9069A47D2C97BFDBF9/

(that only happened when i was clicking on a stack of oil barrels, but for the helptab part, i was loading a new game from the start, and clicking on helptab, and then if the helptab didnt show any entries at all, i removed more mods and tested a new game again).

i did a text search and in case it helps, the only other mod that i have that contains the word "oil barrel" is "Shale - from oil to plastic" (though that has been working fine with helptab and rimefeller for quite a few playthroughs, and regularly make oil barrels, just that i happened to try clicking on the stack for somereason) :)
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1248055193&searchtext=1248055193

(btw that screenshot was taken on 11th January 2019)

looks like you are missing some files to get that error, bad steam download maybe

oh i never thought of that.. :) its possible.. i did run out of space at one point on the usb ssd where steam downloads workshop files. ill try un-and-resubscribing and do some more tests and let you know if still having problem

oh hi, its an SSD usb drive
(ssd storage, which connects via usb) :)