Passing character vectors from R native memory to .NET arrays of strings seems to cause memory leaks. Memory footprint can be tricky thing (working set vs total commit size is confusing me), but this does not look like a false positive.
See a basis for a unit test[there](https://github.com/jmp75/rdotnet-support/blob/master/usersupport/deldir/Program.cs)
Comments: See https://rdotnet.codeplex.com/discussions/532760 for initial report