A complete mystery.
Mining from the get go for several hours with provided wallet(s) + cpuminers.
./maxcoind listtransactions | grep category
...
"category" : "orphan",
"category" : "orphan",
"category" : "orphan",
"category" : "orphan",
"category" : "orphan",
"category" : "orphan",
"category" : "orphan",
...
./maxcoind getbalance
0.00000000
1gh (the pool) just tweeted that there was a discrepancy between the cpuminer code and the wallet code. In other words the cpuminer won't work.