I'm recording lecture on a voice recorder and then importing them to my Mac. I was trying to trim them a bit in QuickTime, but it's not worked out great. When I open the MP3 file, I go to Edit, then Trim. It takes several minutes while it says "loading clips." I'm not sure why that is. Once I trim the file and click Trim, it appears as if the file has been saved in the trimmed state. There is no dark depression mark in the red close box as if the file needs to be saved. But when I go to close QuickTime, it asks me if I want to save changes. Unless you either quit QuickTime or close the red box, there is no way to save the changes. You can't manually go to File-> Save or hit command-S. So, I invoke save by quitting QuickTime. By default it wants to save it as a movie. It gives no description of what that means. So I chose audio only instead. It also gives no description of that (will it keep it as an MP3, does it change the bit-rate etc.). But it seems like the only option. Then my MacBook Pro (current model, top of the line) starts whirring and hissing (the fans). It takes a couple of minutes for a progress bar to even show up. And then it starts very slowly exporting the file. It's just an hour of audio. Once it's exported, I try double clicking the file and came across the attached image. (See below, I don't know how to make the image inline with text.) That took the cake! I've had the same message show up (about an unknown developer) after downloading an Airport utility made by Apple from its own web-site! I know how to open it (right-clicking and choosing open). To be clear, I'm not really looking for advice (unless there is any). I just wanted to vent about what I believe to be bugs in Mac OS X. I've experienced other very similar bugs with QuickTime in Mountain Lion and tried reporting them through Apple's engineering teams. Does anyone else use QuickTime for recording, editing, etc? Have you noticed these types of issues? I feel like there must be very few people who use it, or it would have been fixed. For example, another bug is that if you record a video, audio file, or screen recording with QuickTime, it does not automatically save the file as the OS X Help manual says it does (and as it always had before). And there's no option to save it either. Again, the only option is to export, either through File-> Export or by closing the window (which again gives you no indication the file hasn't already been saved). What makes no sense is that if you export the video you just recorded, the export can take quite a long time. I found out where the videos are stored in their temporary location, and you can drag it out of there instead and it takes no time. Whether you drag it out of the temp folder or export it, the file size, codec, everything is the same! Why would they make you export a file to a second file when you're not changing anything about the file? There are so many more bugs I could go on about in QuickTime alone, but it gets me worked up! All I wanted to do was trim an MP3! Am I missing something or is this just really buggy?