Keep getting this message both in the admin section and when completing a survey. A screen refresh usually clears it and can continue as normal. I have set the /tmp folder from 755 to 777 to no effect.
Also got this when trying to upgrade to 1.92+ after changing the /tmp folder I then get this error message:
PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature
So trying a completely fresh install in a different directory and get the same messages, my webhost doesn't think there is a problem.