[ubuntu_studio] Cinelerra Glitchy Issues

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http://ubuntuforums.org – Hi, I'm using Cinelerra for the first time and I'm having problems. I'm doing simple drag-and-drops of clips (audio + video) and adding dissolve/crossfade transitions. My problem is that the transitions are incredibly glitchy. The audio is crackling, and repeating during the transition and sometimes the same audio glitch will happen in the next transition as well even though it's different audio that's playing at that transition. The video is jittery during transitions as well. Rendering audio and video separately doesn't help. Can anyone tell me what I'm doing wrong? All preferences a (Hardware)