OK, yes, double checked and there does seem to be a problem with the "log me on automatically" thing. Actually there are a number of variables which can be altered, some of which totally mess up the entire logging on process, leaving it impossible or difficult to log on at all (which, having now gone back and looked at things is the reason I started this thread). The current configuration is the most stable I could find at the time to allow all browsers I've tried (Internet Explorer, Netscape, Opera and K-Meleon) all to successfully log on and stay logged on once they've entered the password. However, with this configuration, the "log me on automatically" thing fails.
There were ways of getting it to work, but it had the drawback of meaning that some browsers could not log in at all
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I'll try again shortly to see if there is a way to keep the cross-browser compatability whilst getting the "log me on automatically" function to work. As I've mentioned elsewhere here, I'll have a whole lot more time to devote to the board and everything from around mid-March/start of April onwards so will try altering all the variables one by one and testing on each browser again (quite a few possible combinations) to see if there is a fix around that time.