Hi -- first off, I love this plugin. I've been using it on various sites for quite some time.
However, just recently I was informed by my host that my site's feed is hanging, which is causing an extremely high load on the server (as the script never finishes).
Doing the usual routine of check-deactivate-check, I discovered my feed woes are magically cured when I disable Advanced Excerpt.
I'm not using the plugin in any unusual way (on the affected site, I'm not even using the template function call), and I'm using the most recent version of AE (3.1) and WP (2.9.1).
Any guesses as to what it might be would be much appreciated.