how much were you trying to send? there might be a max amount limit..
Why would there be a maximum limit? and where would that be set? I tried to send a small amount of 186 TX. I remember some time ago with NTRN that you could only send small amounts and that was pretty crap, so why would there be a limit?
I haven't experienced any transaction limiting yet, but as for the issue. Are you selecting each of the inputs individually using coin control to make sure you arent selecting your masternode input?
Also what operating system are you using, and by chance do you have notifications for your system turned off so that messages on your task bar dont appear?
If you do you wont be able to see the error being produced, and the transaction could seem like its doing nothing when really it's trying to throw an error that just gets hidden.
I can only select the masternode input as this is my only address and I was trying to send the stake for the last few days. This is the only address available in coin control.
This is what the log shows:
2016-01-20 10:56:57 socket send error 49
2016-01-20 10:57:12 CoinControlDialog::updateLabels() - Time elapsed: 0.001449
2016-01-20 10:57:19 CActiveMasternode::Dseep() - RelayMasternodeEntryPing vin = CTxIn(COutPoint(0e685018d1, 0), scriptSig=)
I am running OSX 10.11.1