Hmm..i haven't seen that before. For me it usually takes some time to load due to the no of apps, but desktop will be shown.
1. kill the all "qliksense.exe" processes by going to task manager if they are already running
2. open sense desktop again.
3. wait for a min and see, if desktop doesn't pop up open browser and try this localhost:4848/hub
if above doesn't work, then uninstall and delete all qlik sense related files (not QVF's or content) and re install.
Or try with latest 3.0 version and see if you have the same behavior.