st: roll back stata update

["Dimitriy V. Masterov" <dvmaster@gmail.com>]

I updated Stata 11.1 this morning (Win 7, 64-bit). There now seems to
be a problem that some of the I/O functions were compiled by Stata
11.2, so commands like merge no longer work for me. For example,


merge 1:1 survey_id using "geocoded_surveys.dta";
(pathsplit() in lmatabase, compiled by Stata 11.2, is too new to be
run by this version of Stata and so was ignored)
          fullfilename():  3499  pathsplit() not found
                 <istmt>:     -  function returned error


 adoupdate
(note: adoupdate updates user-written files; type -update- to check
for updates to official Stata)
(pathsubsysdir() in lmatabase, compiled by Stata 11.2, is too new to
be run by this version of Stata and so was ignored)
       ffn_of_statatrk():  3499  pathsubsysdir() not found
         read_statatrk():     -  function returned error
find_and_uninst_1dup_std():     -  function returned error
  find_and_uninst_dups():     -  function returned error
    pkg_chk_and_update():     -  function returned error
                 <istmt>:     -  function returned error
r(3499);


Any suggestions about how to remedy this?

DVM
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