A few weeks ago, Dan Rabosky posted a query about phantom text. 

https://stat.ethz.ch/pipermail/r-sig-mac/2012-November/009718.html

I am having a similar issue - using the cmd-Return key combo from the script to the console often generates grey text BEFORE the prompt. 

For example, below, the first test<-rnorm(10,0,1) is generated in the console, then printed by typing in the console, three times.  

The fourth test <- rnorm(10,0,1) is cmd-Returned from a script, generating the new pre-prompt-text.  

I can generate a variant of this behaviour at start-up of R every time.

OSX 10.8.2 Macbook OR MacPro both with R 2.15.2 (64 bit) R.app 1.53 (6335).

> test<-rnorm(10,0,1)
> test
 [1]  0.25936761  0.04522577 -0.62494471 -0.87426290  1.31470309 -0.37134371 -0.03225490  0.02028375
 [9] -0.50492015 -0.74642678
> test
 [1]  0.25936761  0.04522577 -0.62494471 -0.87426290  1.31470309 -0.37134371 -0.03225490  0.02028375
 [9] -0.50492015 -0.74642678
> test
 [1]  0.25936761  0.04522577 -0.62494471 -0.87426290  1.31470309 -0.37134371 -0.03225490  0.02028375
 [9] -0.50492015 -0.74642678
> test<-rnorm(10,0,1)
testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest> test
 [1]  1.4110371  0.3789288  0.4476112  0.3928953  1.1313824  0.3370125 -0.4822913 -0.4033394 -0.1841501
[10]  0.4896509
> 


Andrew
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Dr. Andrew Beckerman
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