Cannot sign messages

[temp-23]

Expected behavior

Generate signature

Actual behavior

Error message (translated):
The entered address is not linked to any key. Please verify address and try again.
(Could not switch software to english version, pls. aslo see screenshot.)

To reproduce

Fresh install of latest version, new encrypted wallet, chain is in sync
File/sign message/get address from addr. book/insert some text to sign/press button "sign message" -> error above

Do I miss something? Need to sign messages for https://foxypool.io/

System information

BitcoinHD Core Version v1.4.3.0-7fe720529 (64-Bit) from guthub
running on Win7pro ServicePack 1