This isn't a serious problem for me, but thought I would mention it -
I was trying to open a huge XML file, and then when I clicked to view it in Grid mode, I got this error message:
"Trying to compute the DOM of this document will probably blow up Stylus and/or make your system crawl. Do you really want to continue?"
I clicked No.
Several of us here appreciate the humor in the message.
Screen cap of warning message