Coppermine version: cpg1.4.19
That's not true - you're running cpg1.4.18, so you should upgrade!
user test account works fine as someone off here has logged in already today
Confirmed. Loging in with "user test" works as expected. From your previous posting I thought that the test user account's logon name was "test", not "user test". Sorry for that.
As suggested, logging in works as expected. However, the link in your phpBB navigation that is suppossed to point to coppermine is wrong: it doesn't point to
http://www.themotorbikeforum.co.uk/gallery/, but to
http://www.themotorbikeforum.co.uk/, so it won't do anything particular helpfull. That's not the core of your problem though. Coppermine doesn't recognize you as being logged in (probably caused by cookie issues - more on that later in my posting). So the first thing you should do is unbridge, then log in with your coppermine standalone admin account, go to coppermine's config and temporarily turn "Allow unlogged users (guest or anonymous) access" to "yes" to make sure you're not being caught in an endless loop.
Cookie name/preifx (if applicable): phpbb3_6bk2l for forum gallery_6bk2l for gallery tried both the same aswell but no difference
That's of course nonsense and probably the reason why you're having issues: I'm not 100% sure, as I haven't been using phpBB for ages, but afaik the cookie prefix for your BBS appears to be phpbb3_6bk2l
_ (note the traling underscore!). This is something you need to figure out in your phpBB setup: there is a config option there where you specify the cookie prefix. Look that up in your phpBB setup, then specify the exact data within the bridge manager. As much as coppermine is concerned, you shouldn't fiddle with the cookie name at all. While being loggegd in into coppermine in standalone mode, set the cookie name for coppermine back to the default "cpg14x" and never touch that option again! There is only one reason why both coppermine as well as phpBB allow end users to specify cookie names: if you're running several forums or several galleries on one domain, you need to make up your mind on renaming the cookie to make sure they don't interfere. However (as in your case), 99% of all users only run
one BBS and
one gallery on their webserver, so you should never have touched to cookie names/prefixes manually - this only leads to complicated setups and the issues you're just experiencing. Most login issues are being caused by newbies who fiddle with cookies although they don't have the slightest idea how cookies work. To make a long story short: end users (the visitors of your page) don't care about cookie names, so you shouldn't either.