I get an interesting message from BFGMiner 2.10.5 under ubuntu while doing solo mining:

[2013-02-16 10:31:46] Cannot append template-nonce to coinbase on pool 0 (-1) - you might be wasting hashing!
[2013-02-16 10:31:46] Cannot append coinbase signature at all on pool 0 (-1)

Using bitcoind for servers...  Now, I have the same configuration running under window 7 against the same bitcoind's with no problems (i.e. Blocks are created and posted to the correct wallet).  It only gives me this error under ubuntu.  (btw, it's amd-64 client)

Tired of buying Window licenses, any clues?