My suggestion would be to try inverting your logic on the main computer...

Instead of blacklisting the arrow keys (which still lets shift-arrows go) whitelist the keys you WANT to go.

I've been using KeyClone for 70 levels on Team Doublemint and not once have I ran across the runaway bug described here, I've also leveled my shaman team to the low 20's and my locks to 10... hours and hours of farming gold...

I've used Whitelisting since the day I installed KeyClone.