Sorry for the belated reply. I wasn't online much yesterday as I was working on the Symbian version of MusiKloud all day and I only had access to the internet on my N8 (long story :/).

I have not experienced anything like that during testing. If I attempt playback whilst a download is in progress, it works as expected, although it may take slightly longer to load as the download is using up bandwidth. I might set a rate limit on downloads whilst playback is in progress (I could make it optional).

Downloads are sequential, so each download begins only after the previous one has completed (or has been paused/cancelled by the user). There is a bug in version 1.0.1 that causes problems when attempting to cancel or resume incomplete downloads that have been saved prior to closing the application. If you re-launch the application and try to resume or cancel a download, the application will segfault. This bug is fixed in version 1.0.2 that is awaiting QA approval. I have tested this morning using 1.0.2, and adding more than one download to the list works as expected on my N950. Whilst one download is in progress, the others show as 'Pending' if downloads are set to start automatically (the label might be 'Paused' in version 1.0.1, I can't remember when I changed it), or 'Paused' if set to start manually, and are started in sequence. However, 1.0.1 should behave in the same way, as no changes have been made that would affect this.

The download speed is dependent on the YouTube server, which is not supposed to serve downloads. In my experience, the speed varies greatly. Earlier, I downloaded a 19MB file in about 2 mins, whereas I'm now downloading a 7MB file and it's taking much longer than that. I could speed it up by downloading different parts of the file at the same time, but that might cause more problems than it solves.

There have been two reviews in Nokia Store that have mentioned that the application freezes/crashes when attempting video playback, so it would seem that there are some device-specific problems. The vast majority of the reviews have been very positive. It's very difficult to get to the bottom of it, as a) I don't have an N9 (although there shouldn't be any difference), and b) if I did, I may well not be able to reproduce the issues, seeing as it appears to affect a very small number of devices (based on the reviews). I wonder if there is any variation in the firmware that has been shipped with N9s. cuteTube has been tested on both the Beta2 firmware (same as that shipped on the N9) and the latest PR1.1 firmware. Performance seemed to be the same in both cases. The only differences are some small aesthetic changes made to Qt Components and the Harmattan Transfer Manager, but those are not specific to cuteTube.