I'm proposing an answer, but refusing to commit to it based on the sparsity of the information provided.

[Q1] - What block height were you at on 0.10.2 when you started the send transaction dialog?
[Q2] - What was the size of your mempool on 0.10.2 when you started the send transactions dialog?
[Q3] - How many incoming / outgoing connections did you have on 0.10.2 when you started the send transactions dialog?
[Q4] - How long had 0.10.2 been running with active connections when you started the send transactions dialog?
[Q5] - What block height were you at on 0.11.0 when you started the send transaction dialog?
[Q6] - What was the size of your mempool on 0.11.0 when you started the send transactions dialog?
[Q7] - How many incoming / outgoing connections did you have on 0.11.0 when you started the send transactions dialog?
[Q8] - How long had 0.11.0 been running with active connections when you started the send transactions dialog?

The answer could be either that 0.11.0 botched the fee calculations, ...OR... your 0.11.0 client instantiation was making a calculation based off of less network information, or less congestion than your 0.10.2 client instantiation.