The invisible-blocks issue persists. The bug is related entirely to orrientation somehow, as it only occurs when opening advanced-build with a block in hand that can be orriented. Normal hull blocks, power blocks, etc, create no issue when opening advanced-build, but everything vanishes when doing so while holding something like a thruster, weapon, or computer.
After replicating the bug, other building GUI parts are still perfectly visable. The build cursor and orrientation arrow can still be seen, and any selected blocks still have the pulsing outline to show what they are connected to. Only the blocks themselves fail to render.