#4 - Oct. 10, 2010, 3:28 a.m.
It seems like you might have the option to have XP listed in your battle log turned off, Niall - I can confirm that this character has not had their XP gains turned off for any reason.
Go ahead and type the following in your chat:
/resetchat
Then check your combat log the next time you kill something. You might also want to turn on the Experience Bar Status Text, so that you can compare definite numbers on your experience bar as you level up. You can do so through the following options:
Options
Interface
Status Text
Then select the last box for Experience Bar Text.