Hey Guys i have a silly problem

By default, if you press w, the weight painter brush appears. But in my case this is what it exactly not does

I'm using softimage xsi 2013/2012 (both have this issue)

Check the preferences to make sure that somehow the key mapping didn't change. I keep having a problem with 2013 that other Autodesk products seem to have as well which is the undo levels keep getting set to 0 every time I open the program, I just mainly use Mod Tool since it's all I really need.

Ive just resetet the preferences
No it works fine but i cant remember changing the animation preferences

Yeah, these versions seem to have some small bugs, never heard of your issue but my 2013 will have the 0 undo levels and I've even heard of Maya 2013 users having the undo problem as well.

Fkn Autodesk and their monopoly, Softimage's development was much faster and bug free when it was ran by Avid.