Citrix and WinTerms

Our WinTerm users are having issues with the Num Lock and Caps Lock keys flashing.  When this happens, equal signs (=) appear and the terminal locks up.  Sometimes the user can right-click the mouse several times and it will go back to normal; however, sometimes the WinTerm has to be restarted.  I cannot seem to find the cause or solution to this problem.  Any help is greatly appreciated.
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I was just searching around on the Citrix site and it appears that there are lots of issues with winterms and the numlock/caps lock keys.  The solution that most people found was to upgrade the build (BIOS) on the winterms.

Dont know which winterm you have but here is the download site for all of them:


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