Hello,
I'm using Syling Tracker 2.4.5 and I get this error:

6x [ADDON_ACTION_BLOCKED] AddOn 'SylingTracker' tried to call the protected function 'UNKNOWN()'.
[string "@!BugGrabber/BugGrabber.lua"]:485: in function <!BugGrabber/BugGrabber.lua:485>
[string "=[C]"]: ?
[string "=[C]"]: in function `Show'
[string "@Blizzard_ObjectiveTracker/Blizzard_ObjectiveTrackerContainer.lua"]:101: in function <...ectiveTracker/Blizzard_ObjectiveTrackerContainer.lua:43>
[string "=(tail call)"]: ?
[string "@Blizzard_SharedXML/MixinUtil.lua"]:341: in function <Blizzard_SharedXML/MixinUtil.lua:340>

Locals:
_ = Frame {
}
event = "ADDON_ACTION_BLOCKED"
events =

I'm using Syling Tracker in conjunction with TomTom addon, if this can help. BTW the interaction between Syling Tracker and TomTom works very well

Hello,

This error is due to taint issues. This type of error is often a nightmare to track down because it can be caused by other addons.

In the War Within, Blizzard changed quite a few things in their tracker, and now it forces their tracker to be re-displayed for every events. I modified my method, and i believe this error may coming from this new one. I have another alternative, but it has a small downside as well.

I understand, thanks for the clarification.