Following your remarks and reports, we have made some modifications on the secure trade tool so as to make the make the characters selection easier and faster.
Please test it and let us know what you think about it. We find it better and we are thinking about using this pattern in other places.
@ phycho - I honestly don't know, but you're level 5, and when I right-click on your name, I see Secure Trade as a valid option for you. (Mini-menu.)
Use the yellow Collection button up top, and Secure Trade should be the bottom option. However, remember that for ANY market transactions (including Secure Trade, I believe), you need to have the market unlocked, first. Check the FAQ (under the Rules) for more info.
Hope that helps!