[bradwery]

It appears that Windows 7 is not supported so I'm trying to evaluate on an XP VM.

I setup x, y, and z arrays that each contain 5000 points. I want to dray a poly line with this data:

AvaxHandle = cAvax1.Add_PolyLine(ref x1, ref y1, ref z1);

Add_Polyline hangs for a long time then I get this error:

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The CLR has been unable to transition from COM context 0x20ba28 to COM context 0x20bb98 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.
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[elias]

The problem is fixed. You can download the latest version.

The problem you report at 'BadImageFormatException' post still exists?