Should I charge for this?

[cgl102770]

I'm a web designer with a client who has online referral forms, and recently, a small percentage of their users can't view the forms. I realized it's because those people work at a government agency with very stringent internet security that will not allow them to view embedded forms.

So, I've spent about 3-4 hours going back and forth with my client, and their clients, and the form hosting company, as well as creating a few test forms to help diagnose the problem. In a way I feel I'm punishing my client for this by charging them, though it is time I spent. Does any one have any suggestions for this? Thank you for any feedback...

 

[Edge]

I guess it depends on whether client agreed to pay for it. You can't just say 'Oh by the way that just cost you £xx'. If no payment was agreed in advance you'll have to chalk it up as a loss and make sure the client knows how long you spent and pointedly say 'Strictly speaking I should charge for this but as good will I won't' or something more eloquent.