Many thanks for your answer.
1. I have downloaded the latest version, only selected local databases were for structures search, but the "resources" still contains databases not selected. Is it designed for purposes that all embedded databases are used for formula search and scoring regardless of any selection? I am wondering if it is possible to use only selected databases for formula as well as structure scoring. or maybe it is better to offer us the option, because for research field other than metabolomics, the embedded databases are not that related and other user-defined databases are preferred.
2. The latest version still have the crash problem, that is when i select "always use pubchem". version 3.30 works fine.