Actually yes, I did (and not only me). The problem is - the calendar plugin uses UTC instead of your local time. I indicated this problem on this very forum, bo nobody cared, my post magically disappeared and is to be found only with help of searching option.
But to the point - here is some bad and good news. The good news is you can modify the plugin php file manually and it works, the bad news is - you have to dig through Seblod V2 forum and find the modified calendar plugin for the older version, then copy all the changes made to that old version to the new version. Then create a new calendar plugin and use it instead of that default one.
It's really an annoying bug that is easy to fix and I have no idea why Seblod team doesn't just correct it.