After casting Profundity, next spell Cast Bar disappears

Platform: Windows
ISP: Time Warner Cable
Type of Internet Connection: CATV
Internet Connection Speed: 15Mbps
Date & Time: July 23, 2011 0333 UTC
Frequency: Repeatable
Character Name: Karleigh Edelweiss
Race: Miqo'te
World: Gysahl
Class/Skill Rank: Conjurer/11
Physical Level: 8
Area and Coordinates: Western La Noscea [17, 23]
Party or Solo: Solo
NPC Name: N/A
Monster Name: Plains Rat
In-Game Time: 4:30
Steps:

1. Cast Profundity on myself.
2. Engage combat with Plains Rat.
3. Cast Fire. (Consuming Profundity Effect)
4. Observe cast bar momentarily appear and then immediately disappear.
5. {Cast Fire.}
6. {Observe cast bar full duration.}
7. End Combat.

Greetings km0s!

Thank you for informing us of the cast bar disappearing. We appreciate you filling out all the required information. We'll be forwarding the concern to be investigated. Any updates may be posted within the forum. Thanks again!