I don't know but I remember there were some issues with CPUminer-gc3355 and Nicehash pool, but for this we should ask to Sandor.
Did the donation pool issue happen again?
For who is posting how to remove the donation pool, changing it directly in the json file and change permission on it could work but read-only permission aren't 777 but 444.
I had about 30% of one of my two rigs on the donationpool the other day based on the amount of accepted shares. I don't think Clevermining, Ghash, Nicehash AND multipool were down but Ghash did work on the donation account. It seems it's not checking up in the list but with an error just going down. I've manually removed the donationpool from the json file but it's a pain to change the password for nicehash every time the rate of scrypt jumps or drops through WinSCP

Would it be possible to make the donation minutes an option starting with 1 minutes increments instead of 15 and higher and remove the donation pool for now? I've already donated around release 1.0 but wouldn't be against donating another 5 minutes a day on top of that.
Exactly the same situation was happening with my miners... It simply moved down the list (5 or 6 major multipools, which could not be down all at once) and end up on donation pool. I also had to remove donation pools manually otherwise using Minera (donating 30% of the time) simply would't make sense.