As many of you i am sure, I jumped on the 747 update as soon as i saw it was available. Download and install went great...but upon loading, I had blank screens and no landing gear(!).
Turns out I *thought* I had upgraded to P3Dv4.4 months ago, but it didn't 'take'. I still had v4.3.29.
Chris at PMDG walked me through it and provided this very helpful info:
"The proper way is to uninstall P3Dv4.3 client and install P3Dv4.4 client. If you try install on top it will not update. Check below forum post in LM forum.
https://www.prepar3d.com/forum/viewtopic.php?f=6322&t=120861 "
I am up and running as we speak and all is well!
Bottom-line - before you update, when in P3D go to Menus, Help, then About, to see if you really have updated to v4.4.