you may need to recompile them if your version of MT4 has been patched recently right click on them/modify then in the language editor hit compile. It happened to me a couple of weeks ago.
I have another question/problem. I have recompiled the indicators, but I can not get all of them to work. When I paste them into the new indicator folder they just disappear. Is it because the new platform does not offer these partifuclar indicators??? If so, what should I do??????