Official TkDiff Version 5.5.1 Released

This quick-fix release alleviates potential crashes caused by missing logic when trying to utilize an older Preference File during startup of the latest software version. Not ALL combinations of "old" Pref-files versus "new" software were affected, and eliminating the prior file and generating a brand new one was a possible way to circumvent the issue; but as the problem was only weeks old, a replacement release felt appropriate. Our sincere apologies to those who just completed installing the prior version.