Sorry if you're experiencing some bugs, we do have an update waiting for approval in the app store which will resolve the splash screen freezing issue, as well as enable iOS5 users to download and install the app.
Regarding the downloading issues bug - we have not experienced that on our end, but are looking into it. The files are quite large (50-75MB) and require a decent internet connection to download (we don't recommend downloading over cell networks). Also, we had to move the app out of Apple's Newsstand due to the AHA Model (members only benefit, the magazine isn't for sale). Because of this, we can only download one issue at a time and it likely the culprit for your buggy experience.
Generally speaking, if you 'hard close' the app and restart, most issues will resolve themselves, but please continue to post bugs here!