[KevinH]

Please make sure you are using Sigil version 0.9.8 and not Sigil version 0.9.7. Once Sigil version 0.9.8 is launched, even once, it will change the sigil.ini file preventing an easy return to Sigil version 0.9.7.

If you are sure that you are trying with Sigil version 0.9.8 then rename your Sigil preferences file:

~/Library/Application Support/sigil-ebook/sigil/sigil.ini

to sigil.ini.old (or anything else really) and they try to start Sigil.

If that works, we know that one of the settings in the old sigil.ini was corrupted. It most likely is a temp path that exists but can not be written to. We can narrow it down further if renaming the sigil.inifile allows you to launch Sigil.

Please let us know what you find out.