i so feel for you...i have been through somewhat the same spot as you have. created a very elaborate scene that took me days to complete using V4 only to come back to a blank pz3. although i did find a solution via the forums, having to re-create the same elaborate scene is not something i would want to do over again. 

as for the updates, i don't think i have downloaded any in a while. i don't think i will be rushing to it any time soon either. things are working perfectly so far and when things comes awry, i will consider the updates.

much luck seal, i do hope you are able to re-create the original if it comes down to that.