Why does ModelSim-Altera Edition no longer support multiple simulation sessions? - Why does ModelSim-Altera Edition no longer support multiple simulation sessions? Description The ModelSim-Altera Edition software requires a separate license for each simulation session. Due to an error in versions 10.0b and earlier, users may have been able to launch multiple simulation sessions with a single license. In version 10.1d and later, this error has been corrected. If you attempt to launch multiple simulation sessions, you may see the error below: # ** Error: License checkout has been disallowed because # only one session is allowed to run on an uncounted nodelock # license and an instance of ModelSim is already running with a # nodelocked license on this machine. For further information regarding this issue, contact Mentor Graphics. Custom Fields values: ['novalue'] Troubleshooting novalue False ['Simulation'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']