How can I stop my characters from sliding in and out of poses at begining and end of walk cycles? Also is there a way of appending one piece of animation to another within Poser. At present I am doing this in Premiere but if the action needs to match it is very trial and error... Any ideas?

This is occuring due to using the spline interpolation. There are a couple of ways. You can manually adjust the values on the parts that are going where No Part Should (the hardest and most tedious), or open the animation pallette, step forward until you are at the last frame that is correct, and at the top find the green button at the extreme right that is called spline break. This places an interrupt in the spline interpolation, and -should- prevent the trouble (you may still have to manually edit the motion values if they have already been entered. Yes, you can combine motion file sets. It will be a different trial and error, but it works. The button with the red sine wave on the animation pallette brings up the graph editor; you will need this later. To combine motions (lets say BVH files, just as an easy one), =save your first animation sequence untouched=. That way you have a clean starting point for when you screw up beyond salvage. Adding a second motion set to the first is as simple as advancing to the frame where you want to add the new motion. Poser adds a new import at the frame location that is -active-, not from the beginning. Tricky part #1. Now you want to add a few blank frames to allow for any time required to get from ending pose A to start of pose B, and this is where you can mess up. Too short and things move too fast, too long and you are in molasses. Once the two motion sets are on the same timeline, select the hip of the character (which is the root node of a BVH file set). Click on the Graph Editor button. (You can close the keyframe editor if you want). In the top right is a dropdown list of all the morphs and axis' that are available. Open that list, and select X trans. The graph that comes up is the root node movement along the X axis. Slide the scroll button at the bottom until you get to the frame where the 1st animation ends and the second one begins. Unless you are incredibly lucky, there should be some significant difference there. Press and hold down the 'Shift' key, and you should see the mouse pointer turn into and 'I' shaped marker. Press and hold your left mouse key, and drag the icon to the right; it should be producing a black field behind it. Release the shift and mouse button, and move the pointer into the black field; you should get two horizontal arrows that point both directions. Now press and hold the left 'ctrl' key, and they should change from horizontal arrows to vertical ones. Everything in that field is selected; all you need to do now is to click and hold the cursor in that area (still holding the ctrl key), and you can drag all the values in that field up or down on the scale. By using this method on all your translations, you can get the XYZ points to match up between animation sequences. Did that make any sense....? (too early, no caffeine....)

Thanks Dale B, Fairly new to Poser but I think I understand what you have suggested and will give it a go...... Watch out for a follow up when I get stuck!