The breaks are really not that different, they have just been a tad later this season. Most major episodes aired on about the same day, so the first, second, ninth, tenth, 14th, ... aired on the 'same' day as last year.
- Season 1: One week break between episode 4 and 5.
- Season 2: One week break between episode 7 and 8.
- Season 1: 6 week break between episode 9 and 10.
- Season 2: 6 week break between episode 9 and 10.
- Season 1: 4 week break between episode 14 and 15.
- Season 2: 4 week break between episode 15 and 16.
- Season 1: 1 week break between episode 17 and 18.
- Season 2: 2 week break between episode 17 and 18.
So that basically means this week is the odd week out, easily explained by a double iZombie episode and a desire to keep Containment paired longer with The Flash than otherwise foreseen. But the feeling is different as the return after the first and third break is a lot shorter this year. Which is probably more easily explained by elections and other unforeseen events.