Yea, things are fairly unstable with my miners. I'm going to try the .EU but are things being resolved on US server?
Whats the problem if I mine only on the EU?
None, unless you have problems with the connection to the EU server. I have never used the US server and for the short time I have been mining at Middlecoin, it has been down once for a few minutes.
Although payments have been made at different times, they have always been made and I am pretty satisfied with the outcome.