I'm using Multisim 12.0.1 on a Windows 7 system (4 core Xeon). Whenever I add a virtual pot to a circuit, the simulation works for a few seconds, then the virtual pot symbol becomes broken and red and all voltages got to microvolts. No errors of any kind are indicated. During the 5 good seconds, I can adjust the pot, but not afterwards. What can I do to get rid of this problem. Current schematic is a virtual pot with wiper into the base of an NPN emitter follower.
Thanks...Steve