Insane Graphical Glitches

When moving from the Cavern of Woe to Merveil's Lair their is a large amount of graphical glitches that I experienced from texture stretching to random mobs turning into rotating polygons. Here are a couple of screen shots to show what I mean

First off, here's the debug screenshot.
http://i.imgur.com/O3ia2.jpg

Here is random colors with texture stretching.
http://i.imgur.com/E3wpr.jpg

Next there's a boss that has transformed into a multiple rotating cubes with random textures on them.
http://i.imgur.com/mjrTT.jpg

I have no idea what to say about this one...
http://i.imgur.com/bV5fv.jpg

For clarification, I have never experienced this bug while playing as any other character other than my STR witch. I have no idea what could of caused this bug and would like to bring attention to Grinding Gear Games regarding this bug.

My video card is an ATI Radeon HD 5670 with all the latest drivers if that helps.

lol :p
You could also add your current in-game graphical settings.
I've noticed with many other games that v-sync causes for some card those texture issues. Try turning it on/off.

I've had these as well, only way I've fixed them is by loading a new instance, even if the same area.

Also my minimap likes to become black and remove the enlarged map entirely until I restart the client.
This happens often along with the above bugs.

Yah i do get dark patch on the ground and wall in that map.

And sometimes after playing for long hours, i also get them in other maps (eg lower prison)

i see that you are low on mana in each screen shot

do you have an item with "graphic glitches when low on mana"