That white page occurs when vshare copies the video from the temp folder to the flvideo folder. If you set your site to process videos in the background instead of processing immediately, your users will get a "successful upload" message immediately after the upload instead of seeing that white screen.

To do that, go to the admin screen, click on Site Settings, go over to the Miscellaneous tab, and pull down the Video Processing menu, selecting "background processing"... it doesn't slow down the video processing at all, just doesn't make your user wait through it.