When I started Pleco yesterday, it stopped immediately (report sent). I do not know why, but it could be the same bug I had reported in 3.2.7 beta 2:
"A very old one: write a 2 character word in the search field of organise cards, search, go back, delete one of the 2 characters, tap hold that character and copy it. The dictionary opens. Now the screen of Organise Cards is empty.
It happened every day, but I never knew when and how. The procedure above should be the shortest way to get there."
This time I have not yet found out when and how it happens and cannot reproduce it, but it did happen. When it has happened, every copy of characters within Pleco transfers them to the dictionary (which is intended for copies from outside Pleco). Actually that is not a problem for me, but maybe for Pleco.