Actually, it forgets the per-row when switching categories by design. Fairly easy fix I suppose, but would rather use a token so that I can handle 10 categories without something like:
wishlist.php?category=Fish&size=thumbs&category1pe rrows=3&category2perrows=3&category3perrows=3
&category4perrows=3&category5perrows=3&category6pe rrows=3&category7perrows=3
&category8perrows=3&category9perrows=3&category9pe rrows=3
If I do a token, then it will be something like &remember_perrows=32203B4 (if there were 7 categories and you wanted rows to be 3, 2, 2, 0, 3, 11, and 4).
Glad you like it so far.