Anyone knows why average spacing between DarkCoin blocks is approximately 157 seconds instead of 150 seconds? I remember that when creating SpreadCoin several months ago I noted that there is a small bug in DarkCoin difficulty retarget which causes block generation to be a bit slower than it should be. But it seems that I lost this knowledge. When I'm now looking at difficulty retarget it looks correct to me, although a bit obfuscated.

Please, let's not start flamewar here. Everyone makes mistakes, we are all human after all.

What errors? Can you please paste them here?
If it starts with "LLVM ERROR: Cannot select" then you need to update your drivers.

Is there any reward for discovering bugs and vulnerabilities? I have found several other bugs.

I successfully converted this private key to SpreadCoin format and now I can steal your 0.16 SPR

If they will give you this private key you can send it to me if you trust me and I will send these coins to your new address. If you don't trust me this will complicate things but we can still figure out how to return these coins back to you.

It is in the code that checks that payments are correct if they are enforced, more specifically it is in these lines: https://github.com/darkcoin/darkcoin/blob/master/src/main.cpp#L2822
I found it about half an hour ago and haven't yet notified anyone from Darkcoin team. This probably is bad, I should think better next time and contact dev first.
I'm still not 100% sure if it is a bug, maybe all the necessary checks are performed somewhere else but I didn't find any other checks.

Not necessarily, while address format is the same, private key format is different, it is necessary to convert it, I will try to do it.

It is far from ready yet but I think I found a potential vulnerability in DarkCoin which allows miners (actually pools) to not pay part of the block reward to masternodes.
DarkCoin wallet checks the following things for each new block:  
1) There is a payment to master node.
2) There is a payment with the same amount as a payment to master node should be (30%).
But there is no check that this is the same payment. This means that if you generate a block you can pay 0.0000001 DRK to masternode and pay 30% and (70% - 0.0000001 DRK) to yourself as separate coinbase outputs. Such blocks should be accepted by DarkCoin network but I haven't tested it on testnet so I can't be 100% sure.

Maybe "block reward" would be more appropriate name?

You need to contact C-CEX and ask them for private key corresponding to this address. Then you will need to import this key into your SpreadCoin wallet but I'm not sure if this will actually work.

No, this transaction is in blockchain: http://spreadcoin.net/explorer/SVMV9Mxk9H9JSrPDAdLeua1FNvnNnU4muw
It may be possible to recover these coins by using corresponding private key from other coin.

What is this other coin? Maybe it uses the same address format as SpreadCoin.

I replaced logo in repository and started builds with the new logo. Then I went to OP to replace logo there but it was already replaced, this shocked me, for a moment I thought that our world was overrun by artificial intelligence that automatically fulfills our wishes After that I remembered that after first logo replacement I pointed it directly to github repo so that it can be automatically updated.

Well, I want to have least some working prototype before such announcements.

For those who want to run miner with older AMD drivers but get "LLVM ERROR: Cannot select", I think I know the solution:
1. Install newer drivers.
2. Run miner once; it will compile necessary binaries.
3. Install older drivers.
4. Execute miner with the same parameters, it will now use previously compiled binary.

For R9 280X you can use binary compiled by me: http://spreadcoin.net/nonsite/spreadcoinTahitiglg2tc8192w256l4.bin
Just place it into the miner directory and use the following parametersyou can vary other parameters but these must be set to these specific values.

If others people will compile binaries for other GPUs then I can add them to the miner distribution and there will be no need to install newer drivers and compile them by yourself.

I will start working on integrating DarkCoin features: masternodes and darksend. I will not copy-paste them blindly, maybe I will make a few improvements if possible. After this we will test it on testnet to see how it is working. Once it is ready I will set a hardfork point and make new builds, I want to make this transition flawless. I understand that there is a lot of impatience, people want everything to happen instantly but I don't think we need a rush here.

Since masternodes and darksend work for DarkCoin I see no reason why it wouldn't work for SpreadCoin. If you have any suggestions about how masternodes/darksend can be made better you can say it.

I will leave the names Masternode and DarkSend as is, I don't see any reason to rename them.

Also I want to write a white paper about my changes and original DarkCoin features themselves, current DarkCoin white papers are either outdated or describe only part of the necessary information. I want my cryptocurrency to have a good description about what it is and how it works.

As others have told you, you are already mining. Since this is solo mining, it is much more random than pool mining. With such hashrate you will need several hours to find one block.

Myriad is currently used only on the website. I don't see much of an issue here; as long as we don't distribute the font itself, only graphics with it, I think it's ok. We probably should use the same font everywhere, on the website, splashscreen and in the about dialog.

Unlike Susel, I like the Montserrat more 

This would be awesome!

Dutch translation: https://bitcointalk.org/index.php?topic=888764
Thanks to LitcoinCollector