This has a fix for some frankly weak code that was left in the Markdown parser for handling ampersands and entity character references. Should be much better now.
This beta version is no longer available. Look for a later beta release or the most recent Mac App Store release.
The latest beta broke naming conventions for files. I use title after auxiliary field - Seq for file names. Previously files were named with - in between the Seq numbers. After the latest beta there is no longer a - in the file names.
Thanks for pointing this out! Try out the latest beta and let me know if this improves things!