If I recall correctly, top_of_shopt was changed in bpl16 to be similar to
the other top_of_XXXs.  You might want to go through shop.c and sedit.c and
make sure they're not using top_of_shopt itself as an rnum.  (E.g., let's
say there are 16 shops, under bpl16+, top_of_shopt == 17, not 16).
For example, in real_shop() change
>  for (rshop_num = 0; rshop_num <= top_shop - top_shop_offset; rshop_num++)
to
  for (rshop_num = 0; rshop_num < top_shop - top_shop_offset; rshop_num++)
Might be worth a try, considering the problem you describe.
-- Meer
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