License error with ModelSim-Altera 10.0c (paid)

Seeing exactly this problem with exactly this version of the tools (e.g., Quartus 11.1, and MS-Alt 10.0 under Fedora 14 Linux). Went through the on-line troubleshooter, came up dry. Have LM_LICENSE_FILE set correctly - in the license setup tool checked the LM_LICENSE_FILE box and the correct path shows up. In addition, the MAC address indicated in the "Current License" box is the MAC address on my machine (it matches the Local System Info on the bottom of the dialog box). Everything seems to be okay, but no joy. Also, I tried to file a trouble ticket to get some help with this one but my search came up dry so I couldn't file a ticket. Would love it a bunch if I could get the Linux tools up and running.