Strange problem with editing thread!!

[anymvs]

Seems that I am running out of thoughts and a good idea is to share my problem with you may you know something more than me..

My problem is that, when I am trying to edit an existing post I get nothing into the screen, a blank screen without text or something, and If I type something the old thread (existing) is disappears. With other words I can't edit any thread.. Also insert image and video buttons links /img and /video BBcodes isn't work to.. When I hit the buttons I get a light white screen (looks like is loading) by isn't appears any kind of box to insert a link picture or video, if I used manually it just print out the live link.. At the end reply with quote isn't work, I don't know what's really happen, but unfortunately before I install my a license skins I didn't check if vbulletin is works as default....

Note::
I have already try to disable all products & plugins, but nothing change.
I have also re-install twice the vbulletin root folder and make upgraded my seems that I miss, from the beginning (when I was started building vbulletin, my serious problem which it's was responsible for other problems, was "permission folders" I don't know why but when I am uploading a folder a file gets 444 or 644 chmod permission and server can't see the content.. Now I have already check all the files for the permission to correct mistakes but unfortunately files & folders are many and for sure I would miss something, I don't know of course if that has nothing to do with my existing problem but I mentioned it may help you understand the whole situation..
(An advice, before you buy any kind of vbulletin skin, search on google, for a good company, because some companies they don't provide appropriate support, I paid to install for me, and at the end I installed alone.)

Thank you in advance!!!!