The laser controls sometimes behave a bit strangely. I expect that a laser should be on when all the following are true:
- The enable box is checked.
- The laser slider has nonzero intensity.
- The "Open Shutters" button is enabled.
However sometimes lasers don't come on even when all of those things are true. In that case the laser does come on if I simply uncheck and recheck the laser enable checkbox. @kdw503 I think this is a bug?