I am aware of the various problems with FTM-produced GEDCOM files, but this appears to be an issue on the RootsMagic side. After I imported the GEDCOM file RM could not find any of the media files that were referenced in the GEDCOM file. After some fiddling around I found that in the Media Gallery view (which appears to list all the missing media entries) that by going through the Properties button I could manually link to the files. The problem that I see is that the path+filename that RM has after import is something like the following:
\/Users/me/Documents/Genealogy/media/filename.jpg
which is correct except for the leading backslash. After "finding" this file via properties the file location is given as:
Y:\Documents\Genealogy\media\filename.jpg
a very Windows-like path+filename. Is there some way to fix this short of manually linking to each of the 400+ media files I've got?