Here is a couple of examples of peculiar order books. They are still technically valid.

Buy and Sell price levels are overlapped (despite the fact they are organized in 2 separate halves - each for corresponding type):

GAZP 2018.07.25 18:42:34.159
0 S 138.6 518
1 S 138.59 1016
2 S 138.58 1
3 S 138.57 2
4 S 138.56 900
5 S 138.55 2412
6 S 138.54 2
7 S 138.51 26
8 S 138.5 11680
9 S 138.49 603
10 S 138.48 652
11 S 138.47 754
12 S 138.45 2256
13 S 138.43 300
14 S 138.42 14
15 S 138.4 1761
16 S 138.39 670
17 S 138.11 200
18 S 134.62 420
19 S 133.55 10627
20 B 143.23 9564
21 B 138.86 533
22 B 138.39 739
23 B 138.38 106
24 B 138.31 100
25 B 138.25 29
26 B 138.24 6072
27 B 138.23 571
28 B 138.21 17
29 B 138.2 201
30 B 138.19 1
31 B 138.17 2
32 B 138.16 2
33 B 138.15 9
34 B 138.13 25
35 B 138.12 1276
36 B 138.11 1553
37 B 138.1 3230
38 B 138.08 515
39 B 138.07 2022

In pink color sell offers are highlighted with price levels which are lower than bottom half of the book, that is below all visible buys.

In blue color buy offers are highlighted with price levels which are higher than upper half of the book, that is higher than all visible sells.

In yellow color both buy and sell offers are highlighed which match each over, that is listed in both halves.

Zero spread

GAZP 2018.07.25 13:45:08.096
0 S 138.19 848
1 S 138.18 372
2 S 138.17 77
3 S 138.16 569
4 S 138.15 952
5 S 138.14 614
6 S 138.13 220
7 S 138.12 704
8 S 138.11 1713
9 S 138.1 464
10 S 138.09 338
11 S 138.08 662
12 S 138.07 700
13 S 138.06 484
14 S 138.05 600
15 S 138.04 264
16 S 138.03 200
17 S 138.02 264
18 S 138.01 157
19 S 138.0 2237
20 B 138.0 625
21 B 137.93 604
22 B 137.92 308
23 B 137.91 936
24 B 137.9 898
25 B 137.89 2395
26 B 137.88 133
27 B 137.87 830
28 B 137.86 2117
29 B 137.85 327
30 B 137.84 576
31 B 137.83 1025
32 B 137.82 1302
33 B 137.81 2212
34 B 137.8 930
35 B 137.79 451
36 B 137.78 5202
37 B 137.77 866
38 B 137.76 319
39 B 137.75 7782

Best buy and sell offers have the same price, that is the spread is zero.

Hi. I've been trying to use this utility, but after trying to export a basic .hob file to CSV the script is crashing MT5 terminal. In the log I can find this message:

"0 22:18:19.722 OrderBook Utilities (WINZ18,M1) Can't read file Books\WINZ18\20181107.hob"

Any clue how to solve it?

Thank you

Please, provide more info - which parameters do you have, how did you get the hob-file, which is the terminal version, what do you mean by "crashing". You may send all the details to me via the private messaging here on mql5.com.