When I sync my K800i with Google, I choose not to sync all my Google calendars. In File menu - Settings - Sync - Calendar - Advanced I only choose one of my five added calendars. MyPhoneExplorer starts to sync all my Google calendars anyway!
This results in my phone saying memory full. I have deleted all earlier entries in the calendar in my phone to ensure that there will be room in the phone. And I have 33MB free phone memory.
Please run MPE in debugmode (Start-Run-myphoneexplorer debug-OK) and send me the logfile after syncing so i can see how many calendars MyPhoneExplorer does read from Google.