Checked the Picoblaze support forum. The experts thought that the block RAMs should be settled by the time reset is released. I ran a little experiment with a program that just loads the general purpose with some known values, then writes them to the RAM. Then I ran a loop to configure the FPGA and check the contents of the memory. Once out of a few dozen to a couple hundred times, the first memory location came up wrong.
So it looks like I'll add a reset delay to run at configuration and insure that things are stable before my program starts up. This issue does not seem to have come up anywhere else, so it's kind of a mystery.
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