Thank you for elaborating on this.
Indeed we were able to reproduce the regional settings problems you described and the fixes will be part of the official service pack release scheduled for the end of the month. If these issues are showstoppers for your project, you will be able to download fixed binaries later today as well via the "Latest Internal Build" option from your Client.Net account.
We have updated your Telerik points for the reports as well.
All the best,
the Telerik team