So, new install on P3Dv4 - plane works (functionally) fine, so this is a minor issue that gave me some mild entertainment.
Upon raising the gear, the model for the front wheel (but not the rest of the gear structure, just the wheel itself) vanishes like magic. If the gear is re-extended the missing wheel magically pops back into place once the gear reaches it's down and locked position. Usually my aircraft only lose wheels after I've ploughed them into the tarmac!
Off topic, I am loving the performance of the 737 on v4, it's a thing of beauty.
Screenshot linked below:
Screenshot on Dropbox
Relevant specs of system:
GeForce 1080Ti (on driver 384.76)
Intel i7-7700K
32GB DDR4 @ 3200MHz
Windows 8.1 64-bit (Also up to date)