[BioC] Gviz, DataTrack, Group plotting

[Jonas [guest]]

Hi.
First of all thanks for this great package. I already made some nice figures with it. However, now I would like to plot from a GRanges objects (actually with the group option), which unfortunately fails. When following the vignitte instructions 4.3 DataTrack I experience the following errors:

#first 
data(twoGroups)
#when I instantiate a DataTrack object:
dTrack<- DataTrack(twoGroups,name="Uniform")
#I got this error:Error in DataTrack(twoGroups, name = "Uniform") :
#A chromosome must be specified for this annotation track.
#so I add a chromosome, which works fine...
dTrack<- DataTrack(twoGroups,chromosome="chrX",name="Uniform")
#the next error occurs when I try to plot the track:
plotTracks(dTrack)
#Error in .defaultRange(trackList, from = from, to = to, extend.left = extend.left,  : 
#Unable to determine plotting ranges from the supplied track(s)
dTrack<-DataTrack(twoGroups,chromosome="chrX",name="Uniform",ranges=twoGroups)
plotTracks(dTrack)
#Error in .local(x, i, j, ...) : (subscript) logical subscript too long

Does anyone have similar problems or knows how to solve this?

Thanks in advance,
Jonas

 -- output of sessionInfo(): 

R version 2.15.1 (2012-06-22)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

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

other attached packages:
 [1] ShortRead_1.14.4    latticeExtra_0.6-19 RColorBrewer_1.0-5 
 [4] Rsamtools_1.8.5     Biostrings_2.24.1   GenomicRanges_1.8.9
 [7] IRanges_1.14.4      BiocGenerics_0.2.0  GenomeGraphs_1.16.0
[10] biomaRt_2.12.0      snpStats_1.6.0      Matrix_1.0-6       
[13] lattice_0.20-6      survival_2.36-14    Gviz_1.0.1         

loaded via a namespace (and not attached):
 [1] AnnotationDbi_1.18.1 Biobase_2.16.0       bitops_1.0-4.1      
 [4] BSgenome_1.24.0      DBI_0.2-5            hwriter_1.3         
 [7] RCurl_1.91-1         RSQLite_0.11.1       rtracklayer_1.16.3  
[10] stats4_2.15.1        tools_2.15.1         XML_3.9-4           
[13] zlibbioc_1.2.0   

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