Minera is indeed very good, but it's still very unstable, and has been like so in the last versions. Things I've been noticing:

1. If I save new settings and restart, minerd hangs randomly, while setting chip frequencies
2. Also, when I save new settings and restart, it sometimes starts hashing but does not accept any shares
(to solve all of the above I have to restart several times till it works)
3. when I add 3 or more pools, it gives errors similar to 1 and 2, and the only workaround is to remove those pools from the config
4. Pool switcher rarely works

Anyone experiencing the same? Any workarounds?