Recently I have a display problem on some drawings. My view is set in discontinuous line instead of normal line, I can change my drawing display style it automatically resets the lines to discontinuous.
I tried to put all my sheet in resolved quality but at the end of the loading it gives it back to me lightening. It only happens on certain drawings and I have heavier drawings.
If it's the same bug you have, it seems that SW mistakes some components for envelopes, so I've changed in the document properties, the line font of the envelope components to style (continuous) and thickness (strong line).
A reconstruction or even a recharge of the plan may be necessary.
Of course, if you need to differentiate between normal and envelope components, this may be a problem.
Indeed Djoulec's solution works but it remains a pernicious solution.
Sorry for the response time, I waited to come back to a plan with the bug. Same type of assembly I think I know which component creates these problems.