Something doesn't sound right - what type atomizer are you using ? Now you say you drip straight down into the atty - then what ? Do you feel the nic hit, and just get no vapor ? What juice are you using ?
I have both the SD MK I and SD MK II and have never had this problem - if the atty were dead, it'd make sense, but sense you say the atty is heating up and turning red - I don't get it ?
Worse case scenario, call TW - maybe even tomorrow, but they may not be there until Monday.
The SD's are great though - very dependable and just work - and I've never popped at atty with them, and believe I've popped a bunch with other MODS.
Keep us posted !
I just re-read you post - is it a new atty - did you try blowing it out good from the connector end ( not the end mouth piece end ) it may still have some of the primer .... in it - try blowing it out real good - then heat it up for a couple of seconds once or twice and let it burn off good - then try dripping more juice in it - I'd drip around 3 drops and give it a try.