@Doitsu - Thanks for the confirmation. I have now pushed a fix for this to Sigil's master.
@stumped
I have many epubs that have extra styles in them and while the stylesheet was in the front tab (showing) I was able to use Tools->DeleteUnusedStyles just fine and never saw a crash or any type of problem when Preview was not open.
I would be happy to keep digging but I will need a sample epub with step by step instructions on how to recreate the crash. With current Sigil versions, I simply can not cause it to crash in the manner you described without Preview open to a deleted resource.
Last edited by KevinH; 06-08-2017 at 12:51 PM.
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