Making my first attempt to use the argo browser, rather than UCSC, I run into the error (with sessionInfo) shown below. Any suggestions? Thanks! - Paul session = browserSession ('argo') Error in .jcall("calhoun/gebo/ui/DesktopFrame", "Lcalhoun/gebo/ui/ DesktopFrame;", : RcallMethod: cannot determine object class > sessionInfo () R version 2.8.1 (2008-12-22) i386-apple-darwin8.11.1 locale: en_US/en_US/en_US/C/en_US/en_US attached base packages: [1] tools stats graphics grDevices utils datasets methods base other attached packages: [1] rtracklayer_1.2.2 RCurl_0.94-0 Biobase_2.2.1 loaded via a namespace (and not attached): [1] Biostrings_2.10.15 IRanges_1.0.9 Matrix_0.999375-18 XML_1.99-0 grid_2.8.1 lattice_0.17-17 rJava_0.6-1 >