WowAce

What steps will reproduce the problem?
1. I am using the side buttons of a logitech g500s
2. My shortcuts are set up as follow : mouse button 5 = keyboard 0
3. When I mouseover a spell over a frame (raid/party/target/myself) nothing happens if I use my mouse button, and with the same spell/macro in mouseover, it works fine.

What is the expected output? What do you see instead?
I'm currently playing shaman restoration. I want to purify spirit on myself or party members. I use a simple macro :
/cast [@mouseover, exists][@player] Purify spirit
This macro is set on the main bar and I should use the keyboard key 0 to cast it. I can also use my mouse button 5 (which corresponds to the file forward/page forward kind of button on a classic mouse).
Apparently Shadowed Unit Frames is preventing me from using this kind of mouse button because, everything is working fine if I use the same macro with a keyboard key.
Anyway is there already a way around this (without finding myself coding or copy/paste part of a code)? Or is this a problem getting resolved soon?

This has nothing to do with addons or unit frames. Mouse buttons use different hooks than keys, and it is not supported by the game by default. Apparently the only way you can achieve what you want is using an addon. I ran into the same issue and found that using Clique is probably the easiest and fastest way for this purpose.

Damn, I'm really sorry for wasting your time then :s I should have checked this before writing the ticket. Thanks for answering right away anyway! I was kind of reluctant to the idea of adding another addOn to my collection, but I guess I succomb to the temptation. Have a great day (or night or lunch or...) and keep up the good work ;)