On what presumably is a default config, I saw something like this setting…
/ip wifi interface capsman
set default ether1,ether2 certificate blah blah blah.
I could not find anywhere in winbox to REMOVE this line???
Note: ALL WIFI menus were BLANK. No entries at all.
@anav has seen the light. At least, that was my first thought.
I think resetting the interfaces should have been enough.
You really should provide export of config so we can check what else you did.
On a more serious note... what version of ROS ? What device used as capsman controller ?
BUT ... /ip wifi interface capsman ? I highly doubt it. That's a non-existing menu path as far as I know.
So once again, we really need to see that export 
However, I THINK you are referring to GUI / Wifi and then button labeled Capsman.
In the dialog box there you can see interfaces to be used and generated (CA) certificates.
But we can not assume, can we ?
So export...
I don't think that will be enough 
, we also need a schematics of the network and the configurations of all devices involved, a list of users, their groups if any, and of course a description of the expected way the whole stuff should work.
You can get that by:
/system/default-configuration/script/print file=default
And then get that file from File
default.txt
You broke all the "Rules of Go(o)d posting" in one fell swoop.
Try to get some rest and get over the flu, instead of fiddling with RouterBOARDs... 
/interface wifi capsman
set enabled=no
set !certificate
set !ca-certificate
set !interfaces
set !package-path
set !require-peer-certificate
set !upgrade-policy
Before anyone says, "Why don't you just do it on one line?", well, figure it out yourself instead of asking...
hahaha, I am getting over the flu, but had to go race in the last PAS Zwift race before they ended.
Wheezing at the moment but really enjoy you phuckers!
Sorry erlinden I have been avoiding the wifi forum, did you miss me??
I didnt expect the rest of you sorry lot to be hanging around in here though.
I obviously was typing from memory seeing the config ;-PP
PS your picture is all wrong.
I recycled it from another topic that was calling me a Monday Expert...
(which by the way... look at that coincidence...)
Being capsman useless, I didnt notice the caps menu HIDING on the far right of winbox on the wifi menu 
