rqt topic monitor failled AttributeError cStringIO.StringO

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Hello every body,

A problem with rqt and topic monitor shows up this morning after an update/upgrade of my system (ubunut 14.04 with ros-indigo)

Since that upgrade I can't monitor any topic without having this error message :

[ERROR] [WallTime: 1488390882.559023] bad callback: <bound method TopicInfo.message_callback of <rqt_topic.topic_info.TopicInfo object at 0x7fafac18d1d0>>
Traceback (most recent call last):
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rospy/topics.py", line 720, in _invoke_callback
    cb(msg)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_topic/topic_info.py", line 100, in message_callback
    self.sizes.append(buff.len)
AttributeError: 'cStringIO.StringO' object has no attribute 'len'

In addition :

• Topics are still operationals since I can visualise them with rostopic echo
• This error occur on many type of message (std_msgs/string, moveit...)
• This error occur regardless the publishing node

Does anyone have some clues ? Concerning me it's look like some python related file or configuration have been corrupted...

Thank by advance.

here below some system's information

Python interpreter version : 2.7.6

System information

Linux version 4.4.0-64-generic (buildd@lcy01-27) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #85~14.04.1-Ubuntu SMP Mon Feb 20 12:10:54 UTC 2017