EDT property changes after restarting client

Hi everyone,

i experienced a very strange behavior in AX 2012.

I set the EDT (Real) property "ThousandSeparator" to "Dot". But when i restart the client it is set back to "None". This also happens to EDT's which are not checked out! This never happend to me before.

Any suggestion is appreciated.

Before:

After:

Regards

Nils