Thank you very much John. That’s very interesting. I knew about Grassblade but not enough. One of the things I find interesting is that they sell and LRS based on LAMP rather than Mongodb. I have installed Mongo and Learninglocker on my VPS but clearly I made mistakes as nothing seems to work. An LRS based on php/mysql would be mush easier for me to deal with though I am not quite sure how much flexibility/space/speed would be lost through not using mongo.
Anyway, installing the grassblade LRS will be an interesting start. Thanks again. That may all kinds of problems.