I did, just after the friedrichshafen break, the suggested solution was deletion of the user folders removal and re installation, which was done but still the problem persists.

and I asked if it was possible to get online and older version to roll back to but was told that they were not available.

instead I switched to android and used the skydemon mobile as a table decoration, now I have an older version which will start but I haven't tried to sync or use it in anger.

Same problem here with win xp since upgrading to 2.6.3

Managed to find an old version. Installed and works fine.