error plotting with anchored features

[welshsae]

When trying to create a new plot set, everything works fine with all plot types, except for 'anchored features'.
When I attempt to run calculation with 'anchored features' selected, I receive the following error:

"Error in is.data.frame(x) : object 'M' not found"

I'm using 10bp bins, statistic mean, no additional options, 1000bp upstream, 1000bp anchored, and 1000bp downstream

If I select "Remove zeros", I get the following error:
"Error in M[M == 0] <- NA : object 'M' not found"

If I select statistic = median, I get the following error:
"Error in apply(M, 2, median, na.rm = TRUE) : object 'M' not found"

What is object 'M' and how can I correct for this error?
I'm using version 3.0.12