Settings dialog will not open

I have installed the Version 1.2.3 on a Windows server 2008R2 i will be able to create PDF Documents but it´s not possible to open the Settings dialog box. In the forum i had found a article that discribe that the adding to the DEP will solve the problem but this will not work for me. If i will click on the setting button the CPU will raise up to 25 - 30 % and the window show me "not responding". I must kill the process to continue.

Please give me a hint