Ubercart

If the ubercart is enabled and the uBrowser not the whole drupal instalation get stucked and nothing will be shown (not even error). uBrowser is made as required, but strangely ubercart doesn't enable him while enabling itself.
I'm not sure if this isn't bug in drupal itself. Anyway it could be fixed on running site be temporary deleting the ubercart directory (which will enable you to access the modules menu) and enabling the uBrowser module.