[Bug 30850] New: use-after-free error when running Gigasoft ProEssentials graph component?

http://bugs.winehq.org/show_bug.cgi?id=30850

Bug #: 30850
           Summary: use-after-free error when running Gigasoft
                    ProEssentials graph component?
           Product: Wine
           Version: 1.5.5
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

A real app that uses gigasoft's graphing component is having
a strange clipping problem when using gigasoft's "scientific graph"
component.  Their canned demo doesn't run well enough to test that component
(see bug 30826), so I extracted just the part that displays
a "scientific" graph.  It seems to run fine, but valgrind complains
about some use-after-free problems:

Invalid read of size 4
    at HEAP_FindFreeBlock (heap.c:1003)
    by RtlAllocateHeap (heap.c:1688)
    by init_region (region.c:485)
    by REGION_RegionOp (region.c:1742)
    by REGION_UnionRegion (region.c:2170)
    by CombineRgn (region.c:1366)
    by add_cap.isra.7 (objects.c:1227)
    by wide_line_segments (objects.c:1470)
    by wide_pen_lines (objects.c:1526)
    by dibdrv_LineTo (graphics.c:891)
    by LineTo (painting.c:242)
    by ??? (in /home/dank/demo100/PEGRP32E.DLL)
    by EnumMetaFile (metafile.c:537)
    by ??? (in /home/dank/demo100/PEGRP32E.DLL)

This looks a lot like the warn+heap crash in bug 30826.

Right-clicking on the demo and exporting it as a .wmf,
then loading it in to a simple app that plays back
metafiles with PlayMetaFile under valgrind shows no warnings in playback.

Source, executable, and a script to install visual C++ and compile 
the executable are attached.
To reproduce: see last few lines of demo.sh in the attached archive.