Allow the direct change of capitalization of measure names
If you rename a measure, and you only changed the capitalization of some letters (e.g. rename a measure called "Test" to "test"), Power Pivot will throw an error saying that a measure or column with that name already exists. This happens in the measure grid in the Power Pivot window and in the Manage Measures window. The workaround is to rename the measure to a temporary name where more than the capitalization is changed, and then rename the measure to the desired name.
Please fix this issue and allow capitalization of measure names to be changed directly.