I'm encountering the following error message when I try to submit an answer:
Unknown column '87948X1163X17329' in 'field list':UPDATE lime_survey_87948 SET `lastpage`='3', `datestamp`='2015-05-03 18:46:32', `ipaddr`='92.72.144.11', `87948X1163X17329`='' WHERE ID=44714
Interestingly, the error occurs only when the survey is activated. In deactivated mode, everything works just fine.
It looks like your responses table is missing a column for a question. It will work while offline since lime doesn't use a responses table while offline. Did you add a question then rename a backup table to be your current table?