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What exactly is the error you get?

I tried it again and a number of payments went through, but then they started failing. I have closed the browser now, as I left it running for over an hour, and was just getting a whole list of error messages to the effect of " payment to @xxxxxx failed, will try again later" Your payment went through OK, but I only got up to the c's in a list of 315 payments. If it was a free service I wouldn't be too concerned, but now if I try to run it again I will have duplicate payments from what I did before.

I wish you hadn't closed the window so we could check the details of the error message in console to see why transactions were failing. My guess is that you have very little STEEM POWER in your account which means you have a very limited bandwidth so you cannot transact too much too quick, so transactions were failing because your bandwidth had exceeded and you needed wait for your bandwidth to recharge just like your voting power. But it's probably a good idea that you closed it because it would most likely take forever due to how much STEEM you have powered up in your account. It's very little and simply not enough to make payments to 300+ people so quickly...

OK, well I lost 0.315 SBD for only a few tips (about 90) sent. I have about 15 Steem Power including delegated Steem so I guess in future I will have to use the tool on less than 24 hours. I will play around with it and try it again with less than 100 tips. Maybe if I set it on 12 hours or less would be optimal.

Yes. Please make sure you have enough bandwidth and if you run out of bandwidth you can leave the window open as it will continue to try and once your bandwidth is recharged, it will transfer them. But for your current SP, it's best to only tip less than 100 people using the tool. I don't do refunds as I warn in the window but I will make an exception for this one and will send you 0.315 - 0.090 = 0.225 SBD back. Peace...

Thanks very much, I do appreciate the refund. Will try another run at some point hopefully with better results.
Edit: just tried it again and got this error message:

Active Followers: 82
Total Fee: 0.164 SBD
Transfering 0.082 SBD To @msg768 Failed.

Check the error message in console and message me on steemitchat. My guess is that the problem is with your bandwidth again.