Until quite recently I was working at a financial start-up called Covestor. Predominantly I was working on their website, but the project was not complete when Ieft. It was good to see covestor.com up today.
The primary technologies were Postgres, Groovy and ColdFusion running on *NIX. It was a rapid education in various areas, including finance IT and working with a alien codebase, and having to find my way around with no real assistance.
When ColdFusion fails in certain fashions, e.g. syntactically incorrect cfscript, it doesn't always provide any reporting. It takes a bit of rooting around to find out that the /500.html page is shown to the user when this happens. However, if the onError function is missing (if you're using Application.cfc) or there is no cferror tag (in the case of Application.cfm), nothing is reported.