@danro It is strange! And I don't want to say it happens ONLY when I double klick, but mostly. Sometimes the section just disappears, and sometimes the area where it used to be becomes completely white and I can't klick it or change it in any way. It's like it's a "dead" area.
When a symbol disappears it also says in my Asset Manager the symbol has "0 Instances" on my website. So it really is as if I deleted it.
As I said it most of the times still exists in my navigator and when I find it there it appears again, but last time it completely disappered on me. It did exist in me Restored version though. So I'm more fortunate than @bartekkustra! And this has happened to me serveral times too, just haven't taken the time to report it since I most of the time can solve it pretty quickly but this time I got a bit more "scared", which is why I report it now.
I'm tired(hey, it's Friday afternoon over here), I'm sorry. So please tell me if this was completely useless to you and you need something else from me. I'd be happy to be of help in any way in solving this issue! Even if it's most probably something I do wrong. Haha