Short cut tools glitching

Every few times I press a shortcut key the tool will not work. It will come up with the error message for ripples or trading marchers the only thing is that I will be pressing the "I" key for a line. If it doesn't send one of the error messages it will put the dotted line you get by pressing 3 or turn my highlighted marchers into an arc or box. Its almost like one key is cycling through all the shortcuts. I found if I continue to press the key the tool will work and everything is good for the next few sets then the same thing happens. It has happened on both Windows and Google Web browsers.

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My browser version is: (do not change)
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7

Have you tried refreshing your web browser or closing out the page first? Hit Ctrl-Refresh (click the Refresh button)

I have tried that but its only a temporary fix it just happens again even after that.

This sounds like something specific to your machine, so I don't know. Have you tried rebooting?

Yes it must be my computer however rebooting didn't help. It's only a minor problem though so i can work around it.