What steps will reproduce the problem?
1. Can't reproduce it, it just happens now and then (maybe once every hour of raiding)
2.
3.

What is the expected output? What do you see instead?
It pops up an error box displaying this message "addons\pitbull_visual_heal\visualheal.lua line 321: texcoord out of range" with a list of my addons. Googling a bit, http://forums.wowace.com/showthread.php?t=10369&page=26 has a post that said SetTexCoord() had limits introduced in 3.1.0 (previously the values could be anything), and possibly changed in 3.1.1, with the values ranging from -10000 to 10000. Looking at that section of code in visualheal, I'm not sure what exactly would cause the amounts (heal to max-health ratio) to be out of that range, but maybe adding a range-check around the SetTexCoord call would help in case that is the problem.

What version of the product are you using?
3.2.11

Do you have an error log of what happened?
Not the full message with all my other addons, I just wrote down some the first part of the error message box: "addons\pitbull_visual_heal\visualheal.lua line 321: texcoord out of range"

Please provide any additional information below.