Can't write to Android Internal Memory

Hi, guys.  I'm having a hell of a time writing to my internal memory.  I have a developer edition Moto X that is rooted and I have several tools to connect and write to it.

OK, this is what I've tried.  

-- I remounted the "system" partition and it shows up as "rw" when I run mount!  Yet I still can't write to it via SFTP.  I get a "read-only" memory error.
-- I can write to the SDcard and I tried writing my file there and then moving it to internal memory using ES file explorer.  Again I got the "read-only" memory error.  

Is this a corrupt file system, or is this normal?  Is this a user/shell permission issue?  Please help....I'm no Linux expert and I really need to put a script in internal memory.  Thanks in advance to all.
Thomas StrussAsked:
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You need to set ES explorer to use root.

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Thomas StrussAuthor Commented:  That did it.  Thanks, gheist.  BTW, for those who want to mess with files on the internal drive you need two things:
1) a rooted bootloader busy-box and super-user installed.
2) ES explorer WITH the "root explorer" turned on.  This is found by going to menu button -> tools -> scroll down to "root explorer".  

I was able to copy my script with no problem from the sdcard to /etc after this button was pressed.
Thomas StrussAuthor Commented:
Oh, and I just  wanted to add that remounting in rw mode was not needed.  I remounted in ro mode again and it still works.
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