There's a bug #115662 for Tkx on rt.cpan.org that was opened three years ago with no response. I appended my log to it yesterday, since I seem to be encountering the same problem with newer software (I'm on openSUSE Leap 15.0)
https://rt.cpan.org/Public/Bug/Display.html?id=115662 I'd appreciate any suggestions. Let me know if you need any more information. Thanks and regards, Dave Howorth