clock error message after mp3 export

[queemacarthur]

I have Pro Tolls 10.3.1 running on a 2ghz Core duo macbook.
I have a metric Halo ULN2 interface. I sometimes work on PT without the ULN2 connected.
Almost every time I use the export file as mp3, then try to play the session again I get a persistent error message "problem with your audio clock" and I have to restart to get pro tools running again.
The mp3 does export but it is very annoying. There are no instances of this message appearing at any other time and I have the same problem whether connected to the uln2 or not.

I encountered the same problem in pt 8 and 9 I have done a total re-install of all software and it still happens.

Any suggestions on how to get rid of this?

[queemacarthur]

I fixed it by trashing all the prefs and databases