In my Google sheet, there was a character that is translated to HTML entity as 
When I tried to open the locally synced ODS file, it showed me an error and Libreoffice was unable to open it (the error was something about wrong format of content.xml subdocument).
Hey there @peci1 I am so sorry for the trouble this has caused you. We would like to help you with this issue, please do send your logs.db (How to find the log files) and a copy of your file to support@insynchq.com so we can look into it. Thank you for your patience!