[Bioc-devel] Problem loading IRanges in devel version

[aedin]

Hi All
I built the devel version of R without problem last week, but I was 
trying a new install today and loading IRanges is falling over.

 > library(IRanges)
Error : Functions for exporting methods must have been made generic, 
explicitly or implicitly; not true when loading ‘IRanges’ for ‘summary’
Error: package/namespace load failed for ‘IRanges’.

BiocGenerics is loading ok. Any suggestions or help would be very much 
appreciated
Thanks
Aedin


 > sessionInfo()
R Under development (unstable) (2012-03-01 r58541)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United 
States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United States.1252

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

other attached packages:
[1] BiocInstaller_1.3.7 Biobase_2.15.3 BiocGenerics_0.1.9

loaded via a namespace (and not attached):
[1] biomaRt_2.11.1 DBI_0.2-5 RCurl_1.91-1.1 RSQLite_0.11.1 tools_2.15.0 
XML_3.9-4.1