As an avid clipper in the community I'm in (I've made over 400 clips this year alone), there are a couple of absolutely infuriating bugs I've been dealing with for several years now.
The first issue is a bug where the first 60 seconds of video of the 90 seconds of captured, editable clip footage will completely disappear, and you'll be stuck with only the most recent 30 seconds. This presents itself in a strange way on the clip page, though. The in-video scroller counts the most recent 30 seconds of video captured as the first 30 seconds of the total 90 second clip time, and as such, the in-video scroller thinks that it is, by its default placement, ahead of any available video; it gets shoved all the way to the right of the scroller, and all you can see is the white circle that you grab to move to different parts of the video (it's stuck above the fullscreen icon). You can't move this little white circle, though, when it's like this. Only when you move the yellow/blue ruler that's below the video to the far left does the in-video scroller move to the left and then let you move it; however, you can only move the in-video scroller within the 30 seconds of video you have, and any unavailable video past that 30 seconds that the ruler has selected (e.g. you have 45 seconds of video selected with the ruler) will be an unavailable region for the in-video scroller (that section of the in-video scroller bar will be gray and you can't move it past that point). I can get this issue to present itself in about 15% of the clips I make, and about 15% of the time when I reload the page of an unpublished clip.
The second issue I have to deal with is when I'm actively editing a clip. This issue occurs when I'm using the in-video scroller (with the white circle you grab to scroll to different sections of video) or the yellow/blue ruler below the video. When using the in-video scroller to move to and watch different sections of video or when moving the ruler to select new sections of video, the video and audio will freeze and stop respectively, and then they will both stay that way. If I try to pause, unpause, select a new section of video with the ruler, or scroll to a separate section of video, the video will stay on the same frame it froze on, and audio will not play. This effectively disables my ability to make a clip, since I have to see and hear what I'm clipping. Reloading the page works sometimes, but I often see the issue persist even after reloading; this requires me to go back into the VOD and make an entirely new clip. This happens in probably 10-15% of clips that I make.
I have recordings of these bugs occurring, and will happy provide video evidence if anyone requires it for further clarification.