That isn't a known issue, but I can probably guess the class of issues
it comes from.
Right-click on the Pd Window and choose "Inspect Background Page"
and then click "Console." It may have an error there. If so copy/paste it for me.
If not, go the the relevant patch window, choose "Help->Show Devtools", and
click "Console" in the window that pops up.
There should be an error in one of those two debugging consoles.
-Jonathan