IBrokers hangs R execution environment

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If IBrokers encounters any error, it hangs the RKWard.  Not sure if this is a 
bug in RKWard or IBrokers, but my guess would be IBrokers.

What steps will reproduce the problem?
1. Run the script below in RKWard two times in a row

What is the expected output? What do you see instead?
If you look in the bottom righthand corner it says "R engine busy" in red.  
Functionality such as viewing variable contents no longer works.

What version of the product are you using? On what operating system?
RKWard 0.5.3 on Linux.


Offending script:
library(IBrokers)
tws <- twsConnect()
aapl <- reqHistoricalData(tws, twsEquity("AAPL"), "20100911 16:00:00", barSize 
= "1 min", duration = "1 D")
twsDisconnect(tws)

Original issue reported on code.google.com by [email protected] on 13 Aug 2010 at 3:20