I just don't get that it tells me 'blockchange found for pool 0 (local execoin deamon) through pool 1 (simplevert)
Oh well, what´s life without a little mystery.
That isn't a mystery. cgminer and derivatives will make use of multiple pools to detect block changes. This is why the readme clearly says not to use on multiple block chains at once (it kinda works, but it's far from ideal). If you're mining at SimpleVert, then it's a good idea to have a secondary pool that is also a Vertcoin pool (active pool + second pool on the same chain!). That way cgminer will use the 2nd pool for block change notifications and not the 3rd (your EXECoin daemon, or whatever else).
Basically, cgminer expects that it is only dealing with one block chain. So, if it sees a Vertcoin block change while you are solo-hashing for your local EXECoin daemon, cgminer will think the daemon hasn't received the notification yet (the pool was faster), and consider the block change valid on the EXECoin chain.
