If you close a window while locator() is waiting for input then Rgui will crash.
Now close the graphics window by clicking on [X] and R will crash.
(Sounds very similar to bug 14872 but this is on Windows rather than Linux.)
R version 3.0.2 (2013-09-25)
Platform: x86_64-w64-mingw32/x64 (64-bit)
 LC_COLLATE=English_United Kingdom.1252
 LC_CTYPE=English_United Kingdom.1252
 LC_MONETARY=English_United Kingdom.1252
 LC_TIME=English_United Kingdom.1252
attached base packages:
 stats graphics grDevices utils datasets methods base
This should be fixed in R-3.3.0 and later; will commit after some testing. Turns out the fix for bug 14872 introduced a Windows-specific bug.