ctrl+r does not work sometimes

I can confirm that I have this problem occasionally as well (windows 7
laptop), I see it more often when clicking the button in the GUI that
does the same as ctrl-R.

Here is my sessionInfo:

R version 2.15.1 (2012-06-22)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

Dear All,

This might be a tiny question but I do not know the reason. On my desktop,
sometimes when I use the mouse or ctrl+A select a piece of R script, and
use ctrl+R to run it,
there is no action. If I redo it, it may work.
On my laptop, it is fine. Both are running windows 7.

Best wishes,
Jie

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