Glenn... sounds right...
Gierloff, Make a temporary directory and move all your plugins to that temp dir. The only things that should be left are XPLM.framework <dir>, XPLMWidgets.framework<dir>, commands.txt, dataref.txt, XP11_64.dll, XP11_64.dll. XP11_64.so, XPWidgets_64.dll and XP11Widgets_65.so. Anything else copy/move to the temp directory you made.... that will JUST leave the base XP11 plugins. Restart XP11 and see if everything goes normal. If it all does, you likely have an old plugin that isnt compatible with the latest patch.
You can copy back the plugins to your plugin directory one at a time, each time reloading XP11 to see IF it crashes.