unfortunately QlikView is notorious for seemingly hanging when in fact it is still working fine. The most common reason for this is either a massive table that is being loaded or synthetic keys being resolved.
Try using a limited load, if it runs fine it usually means large tables are being loaded and you'll have to be patient. If it still 'hangs', check for synthetic keys.
If your script reload hangs at a specific SQL statement there might be some issues with connecting to the database. What you can do in QlikView is to turn on the script log under Settings > Document properties > General > Generate Logfile. This will generate a log in the same folder as the QVW file is stored. If you just leave the reload it'll likely time out eventually.
I would check the DB connection to make sure it works fine with a simple document with just the connection string and a simple SQL select.
