I was messing around with Views 3.0 Alpha 3 and noticed the classes were all messed up when using the 'unformatted' type in views. Instead of getting the usual classes:
views-row views-row-1 views-row-odd views-test views-row-first
I was getting on row 1:
Problem seemed to be in the 'zen_process' function imploding the 'classes_array' into the 'classes' var, while views 3 templates seem to expect the 'classes' var to be a multidimensional array. I solved the above just by commenting out the function for now. I realize Views 3 is still in Alpha so this is more a note for others having problems.