Go to Options and uncheck the "Random Works" option
Seriously, I have experienced the surfaces of cosmetic threads will turn
opaque in assemblies. These particular parts had transparency turned on
prior to applying cosmetic threads (shaded cosmetic threads option checked).
Only way to get rid of the opaque surfaces is by removing the cosmetic
thread from part. Unchecking "shaded cosmetic threads" option doesn't get
rid of the opaque surfaces. Maybe this is how they envisioned it to work.
For me, it is annoying to work in assemblies with opaque surfaces from
cosmetic threads. Also have experienced some (not all) surfaces in
transparent assembly parts will turn opaque. From the assembly must RMB on
part, appearance, color and remove color.
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