It seems that the problem may be due to a change in the way that R resolves links to external DLLs, as mentioned halfway through the stream here .
Adding the PACKAGE = "plyr" parameter to the .Call function call on line 12 R / loop_apply.R in the source (clone from github), and then installing the package from this source ( install.packages ("<path to plyr source", type = "source", repos = NULL) ) seems to fix it.
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