A customer recently had lots of problem updating ICD (created back in IC 10).
BOM did expand, dimensions lost attachment, custom properties gone etc.
This was caused by a Windows Update!
Windows Update KB973923
(security update..ms visual C++ 2005 sp1 . ..)
Removing that solved the problem!
(It's possible to get a list of installed updates on your PC at Win. update and you can block this one from being installed)