After I updated the OS to Win XP SP2 certain functions of XMM don't work anymore: Table View, Native Minitiature View...) After clicking on these buttons the software crashes completely. When re-installing the software the installer asks to replace some newer DLLs with older versions which I of course denied.
I de- and reinstalled the program again - this time with all DDL replaced. The problem persists. Since nobody else seems to have it it must be something else.