I've been trying to map reads using the BWA-MEM tool for the last two days, and Galaxy consistently gets hung up on this step. I've sat for hours waiting for the analyses. Is there something wrong with tool, or the user (me)? I'm working on a coursera project, and this is one of the earlier steps in the process. I can't seem to get past it. Is there a lot of traffic using the site? I keep getting an exclamation mark and an indication that all of the data isn't available. And even when it passes this step, it just sits in the que. Any help/advice would be extremely appreciated.