Hi, I don't know if it's some mistake that I've been committing without realising it, but the Latex facility provided by this forum has given me no end of trouble. The following are two major problems I've faced: 1) Post preview generates a database error if there is too much latex in one post, instead showing the preview result (I can't quantify how much is "too much", but what works is splitting the post into multiple posts and previewing each segment individually, which is why I believe it has something to do with the amount of Latex in the post). 2) Even when it works, the result contains seemingly random errors... again, I haven't spotted the exact pattern of what is going wrong, but either code is interpreted incorrectly, and/or changes that I make to the code do not reflect in previews and/or appear in the wrong place, etc. This is easiest to explain by an example: I'm posting a captured image with some Latex code and the corresponding preview generated so you can see for yourself. I hope someone can help me resolve these problems (assuming it's something to do with me rather than the system) as they have rendered these virtually forums unusable to me. Thanks! PS I don't know whether the result would be correct if I finally posted the message (instead of previewing). I've done this to prevent a totally muddled up post, in case the same problems remain.