Twitch client installed classic/retail version on retail/classic
Retail version.

Describe the bug
Running an alt through Pandaria raids and the following error kept occurring during various fights through out the runs.

Do you have an error log of what happened?
2x DBM-StatusBarTimers\DBT.lua:1511: Action[SetPoint] failed because[Cannot anchor to itself]: attempted from: DBT_Bar_5:SetPoint.
[string "=[C]"]: in function SetPoint' [string "@DBM-StatusBarTimers\DBT.lua"]:1511: in function SetPosition'
[string "@DBM-StatusBarTimers\DBT.lua"]:538: in function Append' [string "@DBM-StatusBarTimers\DBT.lua"]:812: in function CreateBar'
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:11000: in function Start' [string "@DBM-Core\DBM-Core-9.0.21.lua"]:11639: in function Start'
[string "@DBM-ThroneofThunder\Tortos.lua"]:100: in function OnCombatStart' [string "@DBM-Core\DBM-Core-9.0.21.lua"]:6282: in function StartCombat'
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:5862: in function `handler'
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:892: in function <DBM-Core\DBM-Core.lua:879>

Locals:
(*temporary) = DBT_Bar_5 {
0 =
obj =

2x DBM-StatusBarTimers\DBT.lua:1520: attempt to perform arithmetic on a nil value
[string "@DBM-StatusBarTimers\DBT.lua"]:1520: in function MoveToNextPosition' [string "@DBM-StatusBarTimers\DBT.lua"]:553: in function Remove'
[string "@DBM-StatusBarTimers\DBT.lua"]:1218: in function RemoveFromList' [string "@DBM-StatusBarTimers\DBT.lua"]:1158: in function Update'
[string "@DBM-StatusBarTimers\DBT.lua"]:1610: in function <DBM-StatusBarTimers\DBT.lua:1604>

Locals:
Skipped (In Encounter)

8x DBM-StatusBarTimers\DBT.lua:1511: Action[SetPoint] failed because[Cannot anchor to a region dependent on it]: attempted from: DBT_Bar_5:SetPoint.
[string "=[C]"]: in function SetPoint' [string "@DBM-StatusBarTimers\DBT.lua"]:1511: in function SetPosition'
[string "@DBM-StatusBarTimers\DBT.lua"]:526: in function Append' [string "@DBM-StatusBarTimers\DBT.lua"]:812: in function CreateBar'
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:11000: in function Start' [string "@DBM-ThroneofThunder\Tortos.lua"]:124: in function handler'
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:892: in function <DBM-Core\DBM-Core.lua:879>
[string "=(tail call)"]: ?
[string "@DBM-Core\DBM-Core-9.0.21.lua"]:892: in function <DBM-Core\DBM-Core.lua:879>

Locals:
Skipped (In Encounter)

Had you run pvp before? can you make a COMPLETE list of all addons installed as well. also, please reply in this thread. #506

In answer to your question in ticket #512, I have not played any PVP since last expansion. As for an addon list, I will try to post one when I have a second to make it.