Failures running Subversion annotate

Hello, I've got a PyCharm project where running Subversion annotate produces mysterious failures on many but not all of my files. All other SVN operations that I've tried work ok within PyCharm. This happens on both Windows and Mac with 3.0, 3.0.1, and 3.0.2, with and without the "use command line client" option checked. Running svn blame outside of PyCharm works fine on all of these files. I haven't found any obvious commonality between these files such as size that would explain this.

There's not much printed to the message console, just this:

details not found in Traceback (most recent call last):

and some files produce this:

details not found in >         ("odbc", "odbc32 odbccp32", None),

or this:

details not found in Additional details:

Is there some way to turn on additional logging so I can get more of a clue what might be causing this? Seems like it might be some kind of parsing error.