MACDEx users! This indicator from Community Indicators has a breaking change in the current version 2010.09. MACDEx and its derivative indicators used in rule-based or code-based strategies alike before 6.0, will result in a compilation error.

Solution: for code-based strategies - remove an extraneous Bars parameter (check out the online help pages in the Wiki); for Rule Wizard - simply highlight an affected condition (that uses MACDEx or one of its derivatives) and re-select MACDEx (Histogram, etc.) from the Indicators list > Community Indicators.