XPOI is the culprit!
No, it's not.
I unstalled XPOI and ran the addonmanager. Now the Couatl Manager is back again (with GSX) and stays intact!
That's not what I said to do. I said to try installing XPOI, GSX and the Addon Manager at the last thing. Have you tried doing that ?
I will not use XPOI again until you guys figure out what's wrong with it.
Before answering to you, I loaded FSX, went to the same airport indicated in your log ( you edited your message, so there's no Couatl.LOG anymore, but I assure you I tried the same airport) with XPOI enabled, and had all the points visible, stayed for 5 minutes on the runway, and nothing happened, everything was working.
But to reproduce it in the same condition, you should also send your XPOI.INI file, to see exactly which icons you had enabled.
But, we ALREADY HAD the same discussion last month, you already sent your XPOI.INI file, I said it worked here, you first said the Couatl menu disappeared entirely (not after 10 or 20 seconds), then you said that by installing the Stand-Alone Addon Manager last, the issue was fixed.
So, do you want to try again the whole procedure ?