Hi Lawrence,

I got an error when testing the import function.

track <- import(system.file("tests", "v1.gff", package = "rtracklayer"))
Error in parseURI("") : cannot parse URI

I found the parseURI("") was used in the .parseURI function when it run in unix system (io.R line 200).

parsed <- parseURI("")
parsed$path <- uri

#Why just parsed <- parseURI(uri) ?

The parseURI("") acts different in my test. It return a list when It works in one computer, but it gives me the "cannot parse URI" error in another computer.

parseURI("") 
Error in parseURI("") : cannot parse URI

This problem will also affect BSgenome... package. Please help. Thanks!

> sessionInfo()
R version 3.2.3 (2015-12-10)
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=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats4    parallel  stats     graphics  grDevices utils     datasets 
[8] methods   base     

other attached packages:
[1] XML_3.98-1.4         rtracklayer_1.30.2   GenomicRanges_1.22.4
[4] GenomeInfoDb_1.6.3   IRanges_2.4.8        S4Vectors_0.8.11    
[7] BiocGenerics_0.16.1 

loaded via a namespace (and not attached):
 [1] Rsamtools_1.22.0           Biostrings_2.38.4         
 [3] GenomicAlignments_1.6.3    bitops_1.0-6              
 [5] futile.options_1.0.0       zlibbioc_1.16.0           
 [7] XVector_0.10.0             futile.logger_1.4.1       
 [9] lambda.r_1.1.7             BiocParallel_1.4.3        
[11] tools_3.2.3                Biobase_2.30.0            
[13] RCurl_1.95-4.8             SummarizedExperiment_1.0.2