Quote:
Originally Posted by edeniz
Any idea what's going on here?
Thank you kindly 
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No idea what is going on here. Some information such as what operating system you are using and a debug log for the calibre editor would help a lot.
Note: I have only run the calibre editor in debug mode from a command line. I'm not certain running the calibre GUI in debug mode and then launching the editor would generate the debug file.
Note2: I tried deleting all TOC entries and recreating them for a relatively simply epub and did not get a crash. Are you deleting a file (NCX or nav.xhtml?) or the TOC entries?