Bizarre Behavior with Markdown Filter and Cache Clearing We are trying to allow Markdown input on long text fields for certain content types. It is proving difficult. Here is what I have done:


Installed Markdown filter module.
Added a new Text Format in Configuration -> Content Authoring -> Text Formats.
Edited the text fields on our "Lesson Plan" content type so that the user can select "Markdown" text format.


That should be everything I have to do, right?



BUT WAIT -- number 2 above is giving me very strange behavior!


In my "Markdown" text format configuration page, I can't see the Markdown option unless I first clear all the caches while I am on that page.
After I have cleared the cache, the Markdown checkbox shows up, and I can select it.
But after hitting "Save Configuration", the option disappears, and none of my content formats correctly when I try to select the Markdown text format.


Why is this happening? I don't know where to start looking!
I fixed the problem. I don't know why it acted the way it did, but it started working after I deleted the markdown folder in sites/all/modules, and re-installed using the "official" /admin/modules page (which is SSL enabled).