I'm not familiar with the other posts, but have you tried renaming the boot drive to something without space? i.e. ServerHD.
Many thanks Alexander, after doing as you'd suggested (in Terminal type: diskutil rename / newname) removing and reinstalling FM Server (reboot inbetween) I was able to do it.
This is something that perhaps coulld be fixed/averted by the Install process I reckon.
Thanks again, if you are ever (unlucky enough to be) in Edmonton, AB - I owe you a beer!
Glad I could help.
Actually FileMaker did not work clean here, I think, the space in the path isn't escaped somewhere in the Java-console / server communication I assume.