issue with power two*

[Andrew Hersh]

hi folks,
i seem to be having an issue with the power twomeans / power twoproportions commands since updating to Stat15
its pretty straightforward and ive used this a bunch before with out issue but now when i enter a command such as:
power twoproportions .85 .65, test(chi2) n1(25) n2(25)
i get the error message 'twoproportions' found where number expected

i tried going through the dropdown menu, and got the same thing...
any idea whats going on?
thanks

[Nick Cox]

Works for me:

. about

Stata/SE 15.1 for Windows (64-bit x86-64)
Revision 08 Mar 2018
Copyright 1985-2017 StataCorp LLC

<you don't need to know what I've deleted> 

. power twoproportions .85 .65, test(chi2) n1(25) n2(25)

Estimated power for a two-sample proportions test
Pearson's chi-squared test 
Ho: p2 = p1  versus  Ha: p2 != p1

Study parameters:

        alpha =    0.0500
            N =        50
           N1 =        25
           N2 =        25
        delta =   -0.2000  (difference)
           p1 =    0.8500
           p2 =    0.6500

Estimated power:

        power =    0.3685

[William Lisowski]

Perhaps you have created or installed a power command that is overriding the built-in command. The following might help you track down the problem; the output is what I see running Stata 15.1 for Mac.

. which power
/Applications/Stata/ado/base/p/power.ado
*! version 1.1.4  09aug2017

. program list power

power:
  1.         version 13
  2.         local version : di "version " string(_caller()) ":"
  3.         tempname rhold
  4.         _return hold `rhold'
  5.         cap noi `version' power_rsafe `0'
  6.         if (_rc) {
  7.                 _return restore `rhold'
  8.                 exit _rc
  9.         }
 10.         sreturn clear

power._chk4twosampleopts:
  1.         args twosample colon rhs
  2.         local 0 , `rhs'
[remaining output omitted]