Hi thanks for the suggestion, but the problem has returned and that didn’t fix it. I have updated timthumb.php to the latest version also.
I’ve just solved this. For anyone who experiences similar, the value in web.config was too small. I changed mine to the below:
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength=”100000000″ />
</requestFiltering>
</security>
Having just solved this problem on my site, the problem could be caused by the order in which your scripts are being loaded, see here. Make sure you are calling the jQuery script before trying to use a command.