Since your vertical resolution is =<768 the popup will no longer show for you. That is all I can give you for now. Aslain will handle the rest when he gets back I guess.
Solutions are in the posts above yours. Please consider the possible fixes first, before posting something that doesn't contribute to another solution or is irrelevant to the issue.
Version 4.5.6 will most likely also fix the issue. Link to the installer can be found in my signature.
There are only 2 working crosshairs at this moment and I happen to know Jimbo's is one of them, try that one and see if it solves anything. (Not sure if it is related though)
Shame. I really love this one. I wish I had the know how to update some of this stuff but sadly I do not nor do I have the time to actually learn this.