A few hours ago, a new version of Blocs was released that contained some improvements to the App Report System, as well as a few fixes for groups in the Asset Manager.
The release was issued a little earlier than normal in order to gather more info on the recent save bug that has effected a few Blocs users, since the release of the latest version of Catalina.
It was brought to my attention the build (364) was problematic, so I have just issued a new build of 3.5.3 (366) which corrects the issue.
If you already downloaded 3.5.3 (364) earlier today, run in app update and the newer version will be downloaded and installed automatically.
All older builds or Blocs are also available here.