NavNet 3D + MaxSea Explorer Connection Issues

[jglauds]

Greetings sages:

I have Furuno's NavNet 3D with a 12" MFD for my help station (just upgraded to version 2.05) and the 1.7 version of MaxSea Time Zero (MXTZ) Explorer for my laptop. Prior to the NavNet upgrade, the two communicated well -- routes in one would synch to the other, I could see radar on both, etc.

Now, I get error messages on my NavNet when the MXTZ is turned on ... and the "Synch NavNet" button on the MXTZ is grayed out.

Sigh.

I'm in the South Pacific, with slow or non-existent internet, and am having a major problem downloading the 500 meg upgrade file (to v1.9) for MXTZ ... (PS -- why don;t they break these files into manageable chunks for distant cruisers????)

Any ideas? Any similar issues? Am I missing a checkbox in some buried menu?

Thanks in advance ...

/jon