I have issue with Cutadapt. Sometimes it works normally, but often this tool won’t even start running. Everything is gray, and it can stay like that for hours. When I try something else, like Fastqc, there is no similar problem with running. How can I resolve this problem? Is something wrong with server?
Thank you for answers! 
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Welcome, @ive_s
Different tools use different computational resources. Some resources are busier than others.
It sounds like your jobs are queued – and that is normal/expected at public Galaxy servers. These are shared resources, and your jobs will execute when resources become available.
I added a tag to your post that points to many prior Q&A topics about this. Or you can use this search link: Topics tagged queued-gray-datasets
FAQs: Galaxy Support
Start here: Datasets and how jobs execute
Selected public Galaxy resource/server status page: https://galaxyproject.statuspage.io/
Thanks!
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