I have had trouble with incubators in PF for a while now. Prior to the update, I was able to use the UL and one incubator. Whenever I tried to another, I got the error message 5. Since the update, I can only use the UL. I click to use the regular incubator and I get the "Enqueuing user action to Pokefarmer" message and nothing happens. So, I'm running with just the UL.
This is on three different machines and two PF accounts, mine and my wifes.