for the target indicator press alt+t.
for the hp/mana thing try switching back to original UI and then back to sars. if not, turn off all the windows by pressing alt+(s/b/e) and move the chat window around, see if the hp/ac thing just got hidden in a corner somewhere as it happens with SARS when you load it for the first time and try to open the abilities tab, that time it just hides in the bottom right-hand corner.
hire sherlock holmes.
ah and if its just the color thing youre worried about - grab the lil sucker with the right mouse button and play with the shading thing