Not necessarily. I'm just trying to check if the video you want to play is flash-based or if it's an app malfunction. If it's flash-based or an unplayable format, it won't play in a web browser in your phone. If you can play it in the browser though and not in the app, then there's something wrong with the app, in which case the first things to try are always clearing cache and retry, and then re-installing the app and retry.
If the profile you're trying to watch a video from is public, just send me the name or link via private message and I'll see if the video you're trying to watch plays in my phone.