RODBC connection die - using more than 1 Rgui/Rcmdr

Yes, I am aware of that. 
RODBC connection is automatically shutting down without any warnings or
error message. (That's why I jotted down Oracle error message when trying to
reconnect). 

I don't think it's a matter of Oracle since I've tested many query works
simultaneously with multiple windows.

I suspect RODBC's stability with multiple windows. 

That would be a bug, so you should put together a simple example to 
reproduce it.  Avoid Rcmdr, try to just use Rgui and RODBC.  The big 
problem will be the database:  if your example requires Oracle, only 
someone with Oracle will be able to debug it, so try to put together a 
generic example that works with any database with an ODBC driver.

I still suspect Oracle here (it did say "internal error" after all), so 
please do demonstrate it on some other database before you conclude it's 
an RODBC problem.

Duncan Murdoch