I have version 1.1.1 (95)
I messed around with the alarm settings in preferences and now it warns me I have heard a few others on here say it doesn't warn them also but not to sure how I did it.
All I did was change settings in preferences - (Alarm settings)
(Ticked alarm enabled)
(Background query period is set to 5min)
(Notification distance limit is set to 50 km/mi)
(signaling distance limit set to 25km/mi.)
Then alarm signal settings
(Alarm audio signal: set this to what you what your alarm to sound)
(Alarm vibration duration: mine is set to max but doesn't seem to work for me?)
Sorry if this isn't much help.