The extension tries to compress .htaccess files which break in the process.
The problem is that Middleman serves .htaccess as text/html, which isn't correct. I'll look at fixing that.
Closing in favor of the linked pull request. Thanks for letting us know!
Still encountering this issue with middleman 3.0.11, even though I think the pull request made it in :(
Confirmed. Still happens in 3.0.11
My change was made after 3.0.11 was released, you'll have to wait for the next release.
Confirmed that this issue is still present in 3.0.12.
Same bug with 3.0.12
Looks like fix in the master branch, not 3.0-stable. So, for now it will be released in 3.1 only.
Is this something that could be backported to the 3.0-stable branch?
Right you are. I've backported it to 3.0-stable, and it'll be released in 3.0.13 if that happens, or 3.1.