When the Windows Media Sensing "feature" is activated and the
network cable is disconnected, the link to the TCP/IP layers of the
disconnected adaptor is removed. Hence, some apps which try to
verify the MAC adress of this adapter fail the license check.
For a workaround, see more from MS at :
**broken link removed**
I will add my two cents however by noting that some apps like
WG2002 do very well in this situation while others do not
(modelsim). It looks like the mgcld daemon is used by the
well behaving apps while the modeltech daemon is used by the ill
behaved ones, perhaps because it uses an older version of FlexLM.