Hi peter

this is the sample I got:
A B
----------------------------
1 6
1 8
2 1
2 7
3 7
3 3
4 3
4 7
9 13
9 14
10 2
11 1
11 2

after run your macro, the number after 4 is not insert blank row.
A B
---------------------------
1 6
1 8

2 1
2 7

3 7
3 3

4 3
4 7

9 13
9 14
10 2
11 1
11 2