Hi, Am I using the right versions of arrayQuality and hexbin in BioC 1.6? Package: arrayQuality Version: 1.0.11 Date: 2005-04-10 Package: hexbin Version: 1.2.7 Date: 2005-04-06 Working through the 'Quick start guide for marray' I ran into a problem in step 6 [ library(arrayQuality); maQualityPlots(mraw) ]: Error in seq.default(0, 1, length = min(17, maxcnt)) : length must be non-negative number In addition: Warning message: no finite arguments to max; returning -Inf Traceback shows it is in qpHexbin and looking at the function and documentation shows bin is an S4 object of class hexbin and mac$cnt this cannot access the slot 'count'. After fixing that, it runs into: Error in qpHexbin(mnorm, main = "MA-Plot :: Norm") : couldn't find function "hexagons" Error in qpHexbin(mnorm, main = "MA-Plot :: Norm") : couldn't find function "hex.legend" Which I also changed as in below file qpHexbin.R. The library version I've renamed qpHexbin-orig.R. Rob ??