I think the the problem occurs only if using the "regular" edit mode, not the "advanced" one, see the PPS at end of this post.

I've been fighting this for weeks.

From what I can tell, it makes no difference where the percent symbol shows up in the post. It's ALWAYS the first symbol that gets removed, none of the others. This is a real problem when you go to edit your post. First post you have to stick a phantom percent symbol somewhere in there, which will get removed when you submit. When you go to edit, if you don't add the phantom percent symbol back in, the next one gets removed, then if you edit again the next one gets removed, and so on. If you quote somebody who had a percent (that made it through the filtering process), then their's will be removed, if it's the first one in your post, and so on...

I am advanced:
1 pct:
2 pct concatenated:%
3 pct concatenated:%%%

@suicidaleggroll
you're basically right, everything works fine when posting from the "Go Advanced"-mode.
After having edited my answer to add the above sentence one of the test cases is false :P

Ok, it continues in a chain-reaction after each edit

I knew it was related to the fact that percent characters have a special meaning in URLs:

http://www.linuxquestions.org/questi...4/#post5359222

That's wrong. This is due to a bug in the software used by LQ. See my explanation here.

%
%%
%%%
%%%%
%%%%%

Thanks for the in-depth troubleshooting. I don't see anything obvious that would cause this, but we'll take a closer look. It's been confirmed that it's not an issue at CQ/AQ, which is the next version of the platform that will be coming to LQ in the future.

--jeremy

Easily reproducible with this post.

http://www.linuxquestions.org/questi...2/#post5378248

If I edit the post in the non-advanced editor, then the percent sign in the code block disappears. If I edit it in the advanced editor, then the percent sign stays.

One: %
Two: %%
(%) {%} [%]
%%%%%%%%%%%%%%%%
Use the Advanced editor.
100% OK 100% of the time.