No handshake reply from master module

Hie guys..im back again...whenever i run my simulation my project doesnt show diplay pages and just gets stuck on the splash page...i get a no handshake reply from master module error in iQAN design..ive tried using a different version of iqan design and simulate (version 6.06) and it worked the first few hours of installation but now the error is back (failed to establish new communication session), ive also been restarting my machine with no win...kindly assist.