Navionics Platinum + Subscription Issue

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I had a similar situation. I did the 17.45 update, updated all of my NG network components to their latest firmware, and then I purchased a Navionics+ chart chip and downloaded all of the chip updates. When I opened the Navionics Sonarcharts, I could use them without problem, but none of the advanced features were available (the advanced menu items were all ‘greyed out’ and wouldn’t respond). I tried doing the chip eject and then re-insertion as well as several other things, but none of that resolved the problem.
I found out that if I boot my e97 first and then turn on the NG system (i70’s, p70, ev1, itc5, seatalk/seatalk ng converter), all work fine and the advanced features are functioning. Turn on the NG system and then boot the e97, and the advanced features won’t work.
It seems like the chart subscription process in the software is a bit quirky.