What version of the product are you using?
Version: 2.1.9

Do you have an error log of what happened?
It will not error out, nor produce a bugsack report.

What steps will reproduce the problem?
What is the expected output? What do you see instead?

I actually enjoy questing with my toons, so I have a couple of 'quest' related addons. But since the latest patch from Blizz, I seem to have found an interesting bug. It does not error out, nor produce anything reportable by bugsack, its just an oddity that seems to happen when I interact with the questlog.

 (Before I ever open/view the Questlog)
When I use EveryQuest's LDB launcher, the frame shows up just fine. After clicking on a 'quest' from the zone I am in, the default blizzard questlog frame opens up instead of the Carbonite Questlog. The default Blizz Frame works fine, and Lightheaded is displayed as it should. However this is the ONLY time I get this behavior. The rest of the time I get the following odd behaviors annoted below.

(After the Questlog has been viewed for first time)
Again, I get no bug report nor does anything error out, but I get the following odd behavior during gameplay, and after having opened/viewed the carbonite quest log. When I open up Everyquest, and click on any quest listed (even a quest within the zone I am currently in), the actual Blizzard questlog shrinks down to about 1/20th of its size, and is 'visible' in the carbonite minimap. Not the carbonite quest log, but the default blizzard questlog shows up instead. I should mention carbonite minimap is NOT holding my minimap, and they are two seperate frames. (For my minimap, I use Light'n'Stylish Minimap). The only way to correct this visual problem, is to hit my 'L' key to hide questlog inside the carbonite minimap window.

To avoid the problem mentioned above, I must have my quest log open first before I open up EveryQuest (this would be the  carbonite questlog version). Lightheaded displays the appropriate information from the quest selected in Everyquest, and NO miniture version of the default blizzard quest log appears.

These are all the Quest type addons I use:

Quelevel
Lightheaded
Carbonite
EveryQuest
MobMap
TourGuide
Easy Daily
Dailies Quest Tracker

There are several other addons that do impact the map, but I am not sure this information is needed. If it is, I will be glad to provide it.

I am also sending/posting this information on Carbonite forms located at WoWInterface as I can not say for sure its Everyquest doing this, or if it is Carbonite doing this.