Memory leak in QRegExpValidator?!?

[Tiansen]

Ok, I have a problem that is driving me crazy and I cannot find a way to fix it. In my header I have these declarations:

QRegExpValidator* validatorFloat;
    QRegExpValidator* validatorCenaNaEnoto;
    QRegExpValidator* validatorZadnjiZnakSifre;

QRegExpValidator* validatorFloat;
    QRegExpValidator* validatorCenaNaEnoto;
    QRegExpValidator* validatorZadnjiZnakSifre;

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In source file I have this code:

validatorZadnjiZnakSifre=new QRegExpValidator(this);
    validatorZadnjiZnakSifre->setRegExp(QRegExp("[0-9A-Za-z]"));
    ui->ZadnjiZnakSifreEdit->setValidator(validatorZadnjiZnakSifre);
    validatorCenaNaEnoto=new QRegExpValidator(this);
    validatorCenaNaEnoto->setRegExp(QRegExp("[0-9]{1,6}[.,]{0,1}[0-9]{0,2}"));
    ui->CenaNaEnotoEdit->setValidator(validatorCenaNaEnoto);
    validatorFloat=new QRegExpValidator(this);
    validatorFloat->setRegExp(QRegExp("[0-9]{1,10}[.,]{0,1}[0-9]{0,6}"));
    ui->FaktorPretvorbeEnotEdit->setValidator(validatorFloat);
    ui->KolicinaEdit->setValidator(validatorFloat);

validatorZadnjiZnakSifre=new QRegExpValidator(this);
    validatorZadnjiZnakSifre->setRegExp(QRegExp("[0-9A-Za-z]"));
    ui->ZadnjiZnakSifreEdit->setValidator(validatorZadnjiZnakSifre);
    validatorCenaNaEnoto=new QRegExpValidator(this);
    validatorCenaNaEnoto->setRegExp(QRegExp("[0-9]{1,6}[.,]{0,1}[0-9]{0,2}"));
    ui->CenaNaEnotoEdit->setValidator(validatorCenaNaEnoto);
    validatorFloat=new QRegExpValidator(this);
    validatorFloat->setRegExp(QRegExp("[0-9]{1,10}[.,]{0,1}[0-9]{0,6}"));
    ui->FaktorPretvorbeEnotEdit->setValidator(validatorFloat);
    ui->KolicinaEdit->setValidator(validatorFloat);

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When exiting program I get this message in debugger:

Heap block at 095C6DE0 modified at 095C6E24 past requested size of 3c

Heap block at 095C6DE0 modified at 095C6E24 past requested size of 3c

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When I comment out above mentioned lines in source file, then I dont get these message. How can I solve this problem? I tried all approaches that I can think of, but nothing helps. Is there a memory leak in Qt 4.6?

[high_flyer]

start by commenting one variable (and its use) at a time from the whole section.
This way you will locate the variable which causes the problem.
Then, we can look further.