I've had this awesome module installed for almost a year now. Everything was fine up until a few weeks ago, when our users noticed that the export functionality was broken for large results sets.
A results set of 11,447 records will cause the browser to churn for awhile, and finally bomb out with a 500 error (IE) or an error about the file not being found (FF, Chrome).
I've been able to successfully export results sets that number up to 4,078. (I haven't been able to generate a search with more results yet to test.)
Has anyone else experienced this?