The 1.4.1 has just been submitted to the Store. Should be there in ~5 days. (http://appreviewtimes.com). It fixes the tiny but painful bug on Mavericks.
[Update:] The v1.4.1 is now available, 11 hours after the expedited review I requested this morning. Nice!
It has been reported to me that there is an annoying bug for Mavericks users with the latest iObserve version 1.4.0. The « New Object » sheet doesn’t appear at all. Sorry for that! I am currently fixing it and will push it ASAP to the App Store for review. In the meantime, you can use the ‘Import from list’ feature, in the ‘File’ menu (I know, this isn’t as good… Pro tip: Did you know that by alt-clicking on « New Object » you were actually opening the ‘Import from list’ sheet?…
I just discovered that cfitsio has troubles opening files that have a whitespace in their path. In that case, QLFits3 is unable to open the file! I’m on it!