[R-SIG-Mac] problem with source()

[gene]

Since upgrading to R 2.1.0, I've had trouble with the source() command 
in command line R.

When I source() a file, whether that file exists, is empty, or doesn't 
exist, the command runs for about a minute before returning control.  
When run in R GUI, source() returns immediately.  After the first slow 
source(), subsequent calls to source() return immediately.  There are 
no problems with other methods like dir() and read.delim().

Does anyone have any idea what's going on?

Thanks.