Read.delim error in 2.3.0 devel, not in 2.2.0

I get this error in R-devel, but not in R-2.2.0.  Any insight is
appreciated.

Error in read.delim(txtcon, header = TRUE, sep = "\t", na.strings = "NULL")
: 
    recursive default argument reference

sessionInfo()

Version 2.3.0 Under development (unstable) (2006-01-04 r36984)
powerpc-apple-darwin8.3.0

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
[7] "base"     

other attached packages:
GEOquery 
 "1.5.3" 

Thanks,
Sean