Thanks for all the feedback!

A few things are emerging for early miners - notes and recommendations

1. Start the node with
 repnetd -printtoconsole

This will give more information about what the node is doing.

2. Don't start mining until your node is synced.

Keep an eye on the console, when it stops reporting new blocks coming in quickly, it is synced.

3. Use separate accounts for mining and posting.

There is a bug in RepNet.Site whereby it is trying to spend immature coins (freshly mined coins take 20 blocks to mature).

4. --cpus= option doesn't work in the miner yet

Use multiple processes to use multiple cpus for now.

5. Linux binaries may need additional files to run correctly - expect new binaries soon.