Help, keyencoder problem

[SuckerFish]

Hi, in my setup i stripped a 2 player x-arcade into a dynamo cab.
In mame on pc , the buttons binded to Shift, Ctrl And Alt will bind as  "Left Shift Right Shift"  , " Left Ctrl Right Ctrl"  and  "Left Alt Right Alt".   This happens quite often and results are that these buttons will not work in the game ( press them and nothing) .  On the other hand sometimes, i try to bind them and get "Left Shift"  then all works well.

50% of the time works and other half won't work.

What would cause this?  My keyboard? Settings or defective encoder?

Thanks for the help.

[Tiger-Heli]

If you are talking about assigning keys from the TAB menu, this will happen if MAME is paused when you try to change the assignments.

[alphasqorner]

Man, this "left shift right shift" key assignment was so pissing me off and didn't know why it would do it some of the time.
Thanks a lot Tiger-Heli!

[SuckerFish]

Thanks!!
The worst part is I'm not new to Mame, and have never had this problem on my regular home Pc.... weird  

[Tiger-Heli]

Thanks!!
The worst part is I'm not new to Mame, and have never had this problem on my regular home Pc.... weird  

Don't feel bad, I played MAME for years, tried out Analog +, and was telling Urebelscum that something was coded wrong when he pointed that out to me . . .