Issue I355 [80,batchmode,high,resolved] "fastadj" command in batch mode program may cause subsequent command to terminate when run in GUI mode. Reported by rbalthazor-20070124-http://www.simion.com/discuss/viewtopic?t=440 Description: If a Lua batch mode program (e.g. "batch.lua") calls simion.command("fastadj ..."), and if this batch.lua program is run in the SIMION GUI ("Run Lua Program" button), it may prematurely terminate subsequent commands such as simion.command("fly ..."). The program is not affected if run instead from the SIMION command-line mode ("simion.exe --nogui lua batch.lua"). Workarounds in 8.0.1: Workaround #1: Run the batch mode program from a command-line (cmd.exe) window instead. For example, assuming your project folder is "c:\temp\test" and batch program is "batch.lua", cd /d c:\temp\test "c:\program files\simion-8.0\simion.exe" --nogui lua batch.lua Workaround #2: Ensure your potentials always change during a fast adjust. So, instead of simion.command("fastadj test.pa0 1=50,2=100") do this: simion.command("fastadj test.pa0 1=0,2=0") simion.command("fastadj test.pa0 1=50,2=100") Affects: 8.0.0-8.0.1 Resolved in 8.0.2.