Failure to launch (literally).

[Sebiale]

<<Vista 64-bit
Every first time I attempt to log in to my server after starting up my PC, the screen will turn black for a second, and then the program apparently just dies. Checking the task manager confirms that the program is no longer running.
However, after that, as long as I don't restart the PC, there are apparently no problems.

[Mirthgar]

Go into your Documents > Dungeons and Dragons Online folder and open the Userpreferences.ini file and under the [Display] section change "AllowDesktopCompositing=False" to True.

Exit and save the changes to the prefs file and test that out, let me know if it has any effect.