update from 2.0 to 2.05.if your survey has EM like {if(a>,'','')}
,you will see attached situation.
it seemed EM in 2.05 still has little problem,and cannot suport html tag

i am crying now!!

Have you clear the browser cache?

sure,i have got the reason, it's because of the EM.
EM is core function, i have post this problem but nobody pick it.
i think lots of people will face this problem when update to 205.

Sorry, but it is not clear to me.

You say that if you put the code

into a survey, this will destroy the backend of Limesurvey??

I just did a quick test and inserted the code you provided into the question text and into the relevance equation, saved it but all looks fine.

Could you describe this problem a little bit further, so that it can be reproduced? Where do you put this code?

A said by Holch, it's very hard to believe that EM is the source of the problem...
Your screenshot only shows that the issue is related with the (not correctly linked or/and missing) admin stylesheet.

Check that /styles/gringegreen/adminstyle.css file is correctly uploaded.

Yeah, clear your browser cache first, please!