For completeness: this is a local galaxy instance running for few months now, updated recently (27 Jan 'release').
Hello Joachim,
After a quick try with visualising track in Trackster (importing one chromosome of hg19 - which did not succeed BTW), none of the tools in my local galaxy appear to work.

What are the steps you're taking to produce this issue?
I had a BAM file that I wanted to test to view with Trackster. I clicked that icon in the dataset . In the next screen: save in new visualation, which I called test. And I selected there 'Add a custom build'. Next I could select which fasta from my history containing the reference: selected the correct one. I named it "hg19_chrom21". But then, clicking OK, gave an error.

From then on, all tools give the error: Error executing tool: 'hg19'. The point is, I cannot recreate that BAM file, since the required tools are not working anymore... Basically, my Galaxy has become useless. Before I dig up my backup, I hope somebody can help me?

      

        
They all send this error message:

Error executing tool: 'hg19'


      

      
Are you seeing this error in failed datasets? If not, where are you seeing this error?


    

    This error appears in the middle pane, after clicking execute.

    

    

    

      



      

        
This bug has been reported before, but I was wondering if somebody suggest a fix for this?


      

      
Can you provide a link to the thread/issue where this has been reported?


    

    http://www.mail-archive.com/galaxy-dev@lists.bx.psu.edu/msg04216.html

    http://www.mail-archive.com/galaxy-dev@lists.bx.psu.edu/msg03995.html

    

    

      
Thanks,
J.

    

    Thank for looking into this.