I have heard of this problem before but I haven't personally experienced it.

So that someone else might be able to help you, could you answer the following questions?

1.) What operating system are you using? ZQuest 2.5 is known to have problems with Windows 8, so you will have to get a newer version (2.5.1) [Forum Topic Here]

2.) Did you select an item before picking the item marker? I don't know if this would impact the bug, but I wonder if the item you have is invalid and that is causing the problem.

3.) What's your favorite color? (I started making a list and realized only the first question was really important).

I hope somebody can help you with this issue soon.