Table of Contents > Troubleshooting
QLab Documentation
This page last modified: 11 Mar 2010 07:14:28 AM.

Troubleshooting

Why is this cue broken? / Why is this cue showing a red X? ()

Hold your mouse over the broken cue and QLab will display a tooltip that describes why the cue is broken.
A broken cue has an incomplete or invalid parameter. You must fix the parameter before the cue will run. (Note that a Group Cue is the exception to the rule that a broken cue will not run, because a Group Cue never really runs in the first place. It just contains other cues. The non-broken cues in the group will run normally.)

I'm only getting audio out of my first two channels—what gives?

By default, a mono-channel sound file will only be routed out of the first channel of your audio device, and a stereo sound file will only go out of the first two channels.
To customize the routing for your audio, select your Audio Cue and go to the "Levels" tab in the inspector. Use the crosspoint knobs to route the file's audio channels to each desired output channel of the device.

My audio is dropping out / glitching after 2 seconds.

The buffer for Audio Cues holds two seconds of audio data. A dropout or glitch after two seconds usually means that the hard disk had been put to sleep by the operating system, and is not yet ready to supply more audio data by the time the two second buffer has been used up.
This problem can usually be fixed by changing your system preference to prevent the system from putting hard disks to sleep. Go to System Preferences → Energy Saver → "Put the hard disk(s) to sleep when possible" and make sure this is NOT checked.
In some cases an external hard disk may not honor this setting, and put itself to sleep after a period of inactivity. In this case you may wish to put in silent "dummy" cues that are fired prior to when you need to make sure the disk is up and running at full speed. The silent cue can be any small, simple audio file with no sound that can be used to force a disk awake.

After QLab displays a series of still images, it starts to slow down or even crash

Make sure you're stopping old still image video cues that you don't need to run any more.
Video cues that display still images will remain running until explicitly stopped. Even if they are no longer visible (for example, if another still image is covering them), they are loaded and consuming resources. It is important to stop old still image video cues that you do not need anymore, so that their resources can be released.
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