I cannot locate the simulation example files in the latest FrontPanel release (Centos 4.5.5). I expected to find them under Samples/Simulation but that folder is not available. The simulation libraries are present under the Simulation folder so I think the flow is still supported. Can you share a simulation example?
This does appear to be an oversight in the Linux releases of FrontPanel. We will work to include the samples in the next release of FrontPanel on Linux. Until then, you should be able to find the simulation examples in the Windows releases (it should be possible to extract the samples from the exe using something like 7-zip). If you prefer I can also send you the simulation samples directly if you submit a ticket to email@example.com.