yst: Could not load template: layout.tex.st

After running a simple:
# yst create wob

It creates the directory, places in test files, and then promptly complains that it cannot find the layout file that it placed in the directory (I checked, it's there.) If I remove the ".tex.st" portion, it then explodes with a different useless error message (layout.tex.st is now layout_tex.st, and the config file is properly adjusted):
# yst

yst: site\april_events.tex: commitBuffer: invalid argument (invalid character)

I'm a little baffled about this; it looks like there's some kind of internal library conflicts going on; I updated cabal, cabal-install, then reinstalled pandoc, hstringtemplate and yst. Now I'm down to:

yst: site\april_events.tex: commitBuffer: invalid argument (invalid character)

from the base install. It appears to be related to UTF characters in the Haskell API, from searching it looks like a few other Haskell programs have developed this issue in recent versions of GHC.

Start by reproducing `yst create wob` and then `yst` with the generated site. Inspect the generated `layout.tex.st`, the adjusted configuration, and the reported `site/april_events.tex` input; the issue is done when templates load without renaming and UTF characters no longer trigger the invalid-character error.

Written by the indexing model from the issue text.