WowAce

What steps will reproduce the problem?
1. Be in a raid there people come and go a few times, e.g. LFR between bosses.
2. Observe when casting a heal on someone using a mouseover macro, that the heal is not cast on the player hovered over but instead on some other player, or no player at all is apparently targeted.
3. Use "/run print(issecurevariable("CompactRaidFrame1"))" and observe that MrTrader is named as the "offending" addon.

What is the expected output? What do you see instead?

See "2" above. I cannot target the player I want.

What version of the product are you using?

0.6.8.1

Do you have an error log of what happened?

No, sorry. It is just the name of the addon that is written to my chat frame. I may well have other addons that also will give this effect, but I have not seen it since I temporary deactivated MrTrader.

Please provide any additional information below.

The only way to get back in synch with Blizzard Raid frames appears to be to reload the UI.

Reference to a discussion on this topic: http://us.battle.net/wow/en/forum/topic/4768689845