Looks rather random to me.
Some times, when moving through a window, I get an error message for LanguageTool 1.0.0:
java.lang ExeptionInInitializerError, stacktrace: de.danielnaber.languagetool.openoffice.Main.getLocales(Main.java:469)
I had this once in the paragraph styles window while swiftly tabbing my way to another one, and now in the Templates window, while pushing down arrow fast.
Looks as if it happens with fast cursor movement and - since I cannot repreoduce right now - only once per session.
AFAIS, all works fine after the error (did not try any language tool however ;-) )
I'll attach a simple screenshot.
Created attachment 40570 [details]
screenshot with error messages (they come with two)
Now the same error messages showed up by opening a template based document
prolly LanguageTool bug.
Since it is not in the package any more, I close this bug