For those of you using TelcoMiner:
I've found out that the option to "Pay From Balance" to buy more hashing power using your accumulated balance, does not work when you have automatic payout set up.
You will get a warning pop-up stating: Insufficient funds in balance"
You can fix this by (temporarily) switching to "Accumulation" (See "Withdrawal" in menu)
For those not on TelcoMiner yet, see here:
https://telcominer.com/signup.php?ref=54703