Disappearing attachment nodes in SPH

[PocketBrotector]

KSP: Mac 0.90.0 32bit

Problem: Inline attachment nodes sometimes disappear from parts while designing vessels.

Mods installed: MechJeb, Stage Recovery, Kerbal Alarm Clock, TAC Life Support, Kolonization, Extraplanetary Launchpads, SCANsat, Kerbal Attachment System, Active Texture Management, Toolbar, Filter Extensions, KSP-AVC. All are up to date as of Jan 31 2015 per AVC.

Example/replication: in this screenshot, nothing can be attached to the front of the cockpit because the node is missing. Craft file is also available (uses TAC-LS parts); see the problem by removing (then being unable to reattach) the components on the end of either cockpit. In my experience this only happens after radially attaching modular girders for wheels when creating rovers.

Log

This is my first bug report. I've tried to adhere to the standards of good reporting per the sticky; let me know what other information can be added to improve the report.