Product Version: NetBeans IDE 7.4 (Build 201310101600)
Java: 1.7.0_45; Java HotSpot(TM) 64-Bit Server VM 24.45-b08
Runtime: Java(TM) SE Runtime Environment 1.7.0_45-b18
System: Windows 8 version 6.2 running on amd64; Cp1250; en_US (nb)
User directory: C:\Users\David\AppData\Roaming\NetBeans\7.4
Cache directory: C:\Users\David\AppData\Local\NetBeans\Cache\7.4

Steps to reproduce:
1. create method and paste inside this code:
        String[] str = new String[10];
        String[] str1 = new String[12];
        /*koment1
          koment2
          koment3*/
        for (int i = 0; i < str.length; i++) {
            str1[i] = str[i];
        }
2. Allow netbeans to replace your for loop with System.arraycopy()
3. Your previous comment disappears (this problem is also for single line comment)