At 0400 UTC, the NEWFirm filter was K-band. I selected J-band and pressed the button for the filter to change. After a delay, the filter error (red) light came on. We attempted to use the filter "Init" button but this did not fix the error. We pressed the "end-of-night" button, followed by "start-of-night" and the filter wheel still would still not respond. After more conversations, Sean was able to correct the issue by pressing the "end-of-night", followed by "Exit" to close the entire program. After restarting the software the filter wheel became responsive and observations for the rest of the night occured without issue.