Hello, I have already posted this problem on the usegalaxy.eu forum, when you run an EMBOSS program (syco or dotmatcher for example) and you generate a graphic in png format you can’t display it. The output file has 0 bytes and the format is not recognized. This is the history:
Galaxy
I hope you can fix it, thank you
Hi @H1889
Yes, the EMBOSS tools need an update. These tools are not working to produce PNG graphics at any of the UseGalaxy servers.
We have a list of tickets here with what has been requested so far, and you can certainly add to or create a new issue if something isn’t covered yet.
EMBOSS at Issues · galaxyproject/tools-iuc · GitHub
More details → tcode (and other emboss programs) - #2 by jennaj
I don’t see the discussion at the EU Gitter chat (is that were this was asked before? the chat linked from the bottom of the server homepage?) but I would expect they had the same advice but you can clarify that part. Did they just ask you to confirm the issue here? I can confirm it but don’t think there is more I can do. Your first job in the history had a problem with using the same dataset for two different inputs on the same form but that doesn’t matter for this – even with two distinct input datasets the tool still will not generate an output. And the second job was set up correctly, still no output. These are part of what needs to be addressed by the tickets linked above.
I hope this helps to clarify what is going on, and if I missed something, please explain more. Thanks! 
Thanks.
1-I will open a new issue at github. The problem I have detected was not coverred yet.
2-I opened this question at Gitter:
3-They did not ask me to confirm the issue here.
Thanks