Just installed the brand-new 7.02 update for PK51. Lo and behold, my nice cleanly-compiling (under 7.01) project now has unresolved externals (with interesting new names) and code generation errors that didn't exist before. Be cautious about installing this update if you're in a crunch, and keep your older version handy in case you need to revert.
Sounds like the same trouble. I, too, am using memcpy() with dual data pointers.