Print a message when period.apply() is called with FUN = mean because it calculates the mean for each column, not all the data in the subset like it does for all other functions. The message says to use FUN = colMeans for current behavior and FUN = function(x) mean(x) to calculate the mean for all the data. This information is also included in the help files. The option xts.message.period.apply.mean = FALSE suppresses the message. (#124)

Fix error when print.xts() is called 'quote' or 'right' arguments. (#401)

Fix addPolygon() so it renders when observation.based = TRUE. (#403)

Print trailing zeros for index value with fractional seconds, so every index value has the same number of characters. (#404)

Add ability to log scale the y-axis in plot.xts(). (#103)

Actually change the underlying index values when 'tclass' is changed from a class with a timezone (e.g. POSIXct) to one without a timezone (e.g. Date). Add a warning when this happens, with a global option to always suppress the warning. (#311)

Significantly refactor the internals of plot.xts(). (#408)