Filr Mac client 1.01
OS X 10.8.5
Client was working fine but now will not launch.

filr.log on mac shows the following when trying to launch the app.

2013-10-18 18:06:48,466 [INFO] Filr 1.0.1 (18122) is starting. (aca)
2013-10-18 18:06:48,467 [INFO] Loading Growl framework: /Applications/Novell (aca.osx)
2013-10-18 18:06:48,569 [CRITICAL] Exception: <type 'exceptions.ValueError'> (aca.excepts)
Traceback (most recent call last):
File "mainapp.pyo", line 88, in run
File "aca/accounts.pyo", line 267, in __init__
File "aca/accounts.pyo", line 306, in ReadMetaData
File "aca/accounts.pyo", line 60, in __init__
File "json/__init__.pyo", line 326, in loads
File "json/decoder.pyo", line 366, in decode
File "json/decoder.pyo", line 384, in raw_decode
ValueError: No JSON object could be decoded

No software or updates were installed/uninstalled between working and non working state. Other mac clients are fine so it is this machine.

Have uninstalled and reinstalled the app
Updated Java to latest (Apple) version

Not sure where to go from here so any advice would be appreciated