crash in R OS X GUI (PR#7903)

When I type an open paren the (otherwise absolutely wonderful) help  
dialog at the bottom crashes R.

Are you talking about the console or the editor?

For example

polygon(c(

[all is well

polygon(c((

2005-05-27 14:13:14.843 R[478] *** -[NSCFDate characterAtIndex:]:  
selector not recognized
2005-05-27 14:13:14.881 R[478] *** NSTimer discarding exception  
'NSInvalidArgumentException' (reason '*** -[NSCFDate  
characterAtIndex:]: selector not recognized') that raised during  
firing of timer with target 3c8350 and selector 'kickstart:'

This is a very strange error and it's just a soft exception so it  
should cause no crash - hitting <Esc> should get you back on track.  
But if it was a crash (with the famous "app unexpectedly quit"  
message), then there should be a  proper crash report - that would be  
more helpful in that case. Can you, please, run the debug version  
(from http://www.rosuda.org/R/nightly ) and send me the full report  
if this occurs again?

But I can't now reproduce it. Do you know about this bug?

Not directly - it's hard to tell whether this is a bug if it's not  
reproducible ;). Did you run any computation in R while typing this?  
Was a Quartz window busy plotting something at that point?

Thanks,
Simon