Windows 8 copy-paste problem

Hello,
I have a very strange problem. In my work I have to copy information from a field in a PDF file and then paste it in a HTTPS secured web page field. Sometimes everything works fine but there are times where every second copy-paste is not working and I'm not pasting anything. This started happening after I installed windows 8. I'm doing everything as I should so where is the problem?

I've looked in the net and some people suggest that the problem may be in the coping from an unsecured PDF file into a secured HTTPS webpage. However nobody suggest any solution if this is the problem...

Please help! Thank you.

Kind regards,
Katherina

The person that creates a PDF form has a lot of options available to restrict what the user can do including copy and paste. Unless you are sure these forms were created for unrestricted use, that is likely what is going on.