Yeah... training sword showed this problem last night. I fight in mostly defensive when training in order to do less damage and get more hits in per kill. Targeting trepors I usually took 12 or so hits. In order to hit them 12 times, on average I had to retarget and attack 6 times per kill. This is HIGHLY annoying and made my training drag on for what felt like forever. This was with Trepors and Ulbers that I was engaging. If the fight stalled, the Ulber/Trepor would stay engaged but would never attack me again. If i moved, it would follow me, but never actually hit me after the first hiccup.
64-bit Linux client, 0.4.01 with updates as of last night, Fedora 7 (64-bit), AMD 64-bit with nVidia graphics card, Oja Road 2.