I experienced a full screen, "blue screen"-error while in assembly. (Had to switch the computer power on/off to get over it.)
Is the assembly file now corrupted because of the blue screen error ?
I would suggest that you get in touch with GTAC support team for it. They will be in a better position to look into the matter.
Alternatively you can do FILE/UTILITIES/PART CLEANUP also (but first take the backup of the files before trying it out)
Now it appears to beworking.
Fix was something like:
I opened again subassemblies and parts in use when blue screen happened and saved them.
Then I shut down the laptop and pulled it from dock so no power in it and put the power on.
Now it is fine.